Bad DPFE Sensor Symptoms (What Is It, Causes, Fixes & Replacement Cost) | Brake Experts (2023)

Proper fuel and air combinations are required to properly operate any internal combustion. The DPFE sensor aids in measuring the volume of air entering the engine. Your car might have various issues if this sensor is not functioning properly.

If the DPFE sensor is not working properly, the EGR system may have problems. As a consequence, emissions and fuel efficiency may be improved. In rare circumstances, a damaged DPFE sensor might cause the engine to stall or operate abnormally. The best solution to these problems is to replace a faulty DPFE sensor.

This article will discuss the signs of a faulty DPFE sensor, its causes, and solutions. We will also pay the price if this component has to be replaced.

Bad DPFE Sensor Symptoms (What Is It, Causes, Fixes & Replacement Cost) | Brake Experts (1)

What is a DPFE Sensor?

A DPFE sensor (differential pressure feedback EGR) keeps track of your car’s exhaust gas recirculation (EGR) system. Emissions are decreased, and exhaust gases are recycled via the EGR system.

The pressure differential between the exhaust gases entering and leaving the EGR system is measured by the DPFE sensor. The engine control module (ECM) uses this data to check the EGR system’s functionality.

Two hoses are attached to this sensor, which is mounted on the EGR valve. The intake manifold is served by one hose, while the exhaust pipe is served by the other. The DPFE sensor monitors the pressure differential between these two hoses.

Too much exhaust gas is circulated if there is an excessive pressure differential. This may result in various concerns, including lower fuel efficiency, elevated emissions, and poor engine performance.

Do all cars have DPFE sensors?

Not all brands and types of automobiles have DPFE sensors, although they are becoming increasingly prevalent. DPFE sensors track the pressure differential between the atmosphere outside the car and the exhaust gas recirculation (EGR) back into the engine.

The computer in the car uses this data to control how often exhaust gases are returned to the engine.

To help in lowering emissions, the EGR system pumps some of the exhaust gases back into the engine. The engine, however, may have issues if there is an excessive amount of exhaust gas recirculation. To guarantee that the right quantity of exhaust gas is recirculated, the DPFE sensor is used.

(Video) Most Common Symptoms Of Bad EGR Valve | Signs of failing EGR

Even without a DPFE sensor, your car could still have an EGR valve. The EGR valve manages the recirculation of exhaust gases into the engine.

However, the computer will not be able to appropriately control the flow of exhaust gases without a DPFE sensor. This can cause issues with the engine. Check your owner’s handbook or contact your technician if you are unsure whether your car has a DPFE sensor.

When Does a DPFE Sensor Go Bad?

There are several signs that your DPFE sensor is malfunctioning. These consist of the following:

1. The Check Engine Light Is On

A check engine light that is lit is one of the first signs of a DPFE sensor issue. The ECM frequently sets a diagnostic trouble code when it notices an issue with the DPFE sensor (DTC). You may identify the issue by reading this code using a scan tool.

2. Rough Idle

Rough idle is another typical sign of a faulty DPFE sensor. The pressure differential between the exhaust gases entering and leaving the EGR system is monitored by the DPFE sensor. The engine may run rough if this pressure differential is too great.

3. Decreased Fuel Economy

The engine may operate less efficiently if the DPFE sensor in your car is broken. The fuel economy may suffer as a result of this. You could sometimes notice a loss of 1-2 miles per gallon.

4. Stalling

An unreliable DPFE sensor may sometimes cause the engine to stall. The main culprit here is often a significant pressure differential between the exhaust gases entering and exiting the EGR system. The engine may stall if this pressure differential is too great.

How are DPFE sensor issues diagnosed?

You must attach a diagnostic tool to the car’s computer to identify DPFE sensor issues. Following that, you may search for any codes about the DPFE sensor. Before the sensor can be changed, any codes that may be present must be resolved.

The DPFE sensor may sometimes need to be cleaned before being replaced. A brush and a unique cleaning solution may be used for this. To avoid damaging the sensor, be sure to carefully follow the instructions.

After the sensor has been repaired or cleaned, you need to reset the computer’s error codes and give the car a test drive. This will enable you to confirm that the issue has been resolved. You may need to have the computer system of the car checked for other issues if the problem persists.

(Video) How to diagnose a Faulty Differential Pressure Feedback (DPFE) Sensor - 1998 Ford Explorer

How to Use an OBD-II Scanner to Diagnose DPFE Sensor Issues?

You must connect an OBD-II scanner to the car’s computer to identify DPFE sensor issues. Following that, you may search for any codes about the DPFE sensor. Before the sensor may be changed, any codes that may be present must be resolved.

The DPFE sensor may sometimes need to be cleaned before being replaced. A brush and a unique cleaning solution may be used for this. To avoid damaging the sensor, be sure to carefully follow the instructions.

After the sensor has been repaired or cleaned, you need to reset the computer’s error codes and give the car a test drive. This will enable you to confirm that the issue has been resolved.

If the issue continues, you may be required to have the car’s computer system evaluated for additional problems.

How Can DPFE Sensor Issues Be Diagnosed Without a Scanner?

Diagnose DPFE sensor issues even if you do not have an OBD-II scanner. The sensor’s power supply fuse should be checked first. The sensor cannot be tested if blown; a new fuse must be installed first.

After changing the fuse, use a multimeter to test the sensor. Touch the leads to the sensor’s terminals while the multimeter is set to measure resistance. The measurement must fall in the range of 0.5 and 2 ohms. The sensor must be changed if it is not.

After the sensor has been repaired or cleaned, you need to reset the computer’s error codes and give the car a test drive.

This will enable you to confirm that the issue has been resolved. If the issue continues, you may be required to have the vehicle’s computer system evaluated for additional problems.

Can I Replace the DPFE Sensor on My Own?

The DPFE sensor may be changed by yourself, yes. It is important to remember that changing the sensor will not make things better if the sensor is not the cause of the issue. If the issue still exists after replacing the sensor, you may also need to have the car’s computer system inspected for further problems.

Why Would a Replacement DPFE Sensor Be Necessary?

The DPFE sensor may need a replacement for several reasons. One explanation is if it is not reading properly. As a result, the car can operate inefficiently and emit more pollutants than required.

(Video) SYMPTOMS OF A BAD EGR VALVE

A broken or clogged sensor is another possibility. Performance issues with the car may result from this.

What Equipment Is Required to Replace a DPFE Sensor?

You will need a few tools to replace the DPFE sensor. A new sensor, a ratchet, and a socket wrench are required. If the sensor has to be cleaned before being replaced, you may also require a cleaning solution and brush.

How do I replace the DPFE sensor?

  1. Track down the DPFE sensor. Normally, it is near the engine on the firewall.
  2. The sensor’s electrical connection should be disconnected.
  3. Bolts holding the sensor in place should be removed.
  4. Check the sensor for damage by removing it. You will need to buy a replacement if it is damaged.
  5. You may attempt cleaning the sensor with a specific solution and brush if it is not damaged. To avoid damaging the sensor, carefully follow the instructions.
  6. Reconnect the electrical connection and bolt the sensor into place once it has been changed or cleaned.
  7. Take the car for a test drive after clearing any remaining computer codes. This will enable you to confirm that the issue has been resolved. If the problems continue, you may need to have the computer system of the car checked for other issues.

What Takes Place When a DPFE Sensor Fails?

Numerous issues may arise if a DPFE sensor malfunctions. One issue is that the car will operate inefficiently and emit more emissions than is required.

The possibility of the car entering limp mode is another issue. This implies that the engine can only operate at a certain pace. To prevent the engine from being harmed, this is done.

Finally, the check engine light may illuminate if the DPFE sensor malfunctions. If this occurs, you must have the car’s computer system inspected for any other problems.

FAQs

What Is Limp Mode?

The engine management system of your automobile has a function called “limp mode” that is intended to reduce the harm an engine failure may do.

The computer in the automobile will automatically go into limp mode when there is an engine failure, which reduces the amount of power the engine can generate. This enables the automobile to be driven to a safe area while preventing additional engine damage.

Typically, a sensor that identifies an engine failure initiates the limp mode. The car’s computer will receive a signal from the sensor and activate the limp mode.

Knock sensors, camshaft position sensors, or crankshaft position sensors are just a few of the several sensor types that might activate the limp mode.

Other factors, such as low coolant level, excessive engine temperature, and low oil pressure, may also trigger the limp mode. The car’s computer will put the engine in limp mode if any of these things are found, protecting it.

(Video) P0405 EGR Sensor A Circuit Low (failed DPFE sensor)

The car’s engine can only generate a certain power level once the limp mode is engaged. The automobile will typically not be able to accelerate quickly enough or attain its peak speed due to this power loss. There are times when the automobile could even stall.

How Long Are DPFE Sensors Good For?

A DPFE sensor typically lasts a vehicle’s lifetime, but some factors, including exposure to extreme heat or vibration, might reduce its longevity when a DPFE sensor malfunctions, an obstructed filter or an electrical issue is often to blame.

How Can DPFE Sensor Damage Be Prevented?

Ensure you routinely clean your engine’s air filter and steer clear of driving in dusty or muddy situations to prevent DPFE sensor damage.

Consider changing your car’s cabin air filter more regularly if you reside in a pollen-heavy location. When working on your engine, be cautious not to bump or drop the DPFE sensor.

Can I Drive Without a DPFE Sensor?

Yes, you may still drive without a DPFE sensor, but your car cannot control exhaust gas recirculation effectively. This could lead to higher emissions and worsened fuel economy.

Driving without a DPFE sensor may cause the check engine light to come on. If your car has one, it is preferable to swap out the DPFE sensor.

Can a Defective DPFE Sensor Harm My Car?

If a faulty DPFE sensor is not changed quickly, it might harm your automobile. Driving without a DPFE sensor might cause your engine to work too hard, resulting in higher pollutants and less efficient fuel use.

Your engine may run lean due to a blocked DPFE filter, which might harm the catalytic converter. As a result, swapping out a damaged DPFE sensor as soon as feasible is critical.

What Is the Price of a New DPFE Sensor?

The price to replace a DPFE sensor varies depending on the make & model of your car. A replacement DPFE sensor can cost you anything from $50 to $200.

Conclusion

A DPFE sensor device keeps track of your car’s exhaust gas recirculation (EGR) system. Emissions are decreased, and exhaust gases are recycled via the EGR system.

(Video) SYMPTOMS OF A BAD ECM (ENGINE CONTROL MODULE)

The pressure differential between the exhaust gases entering and leaving the EGR system is measured by the DPFE sensor. The engine control module (ECM) uses this data to check the EGR system’s functionality.

The EGR system may have issues if the DPFE sensor is malfunctioning. Increased emissions and poor fuel efficiency may result from this. It may sometimes also cause the engine to stall or run rough. The most effective solution to these issues is often to replace a damaged DPFE sensor.

FAQs

Can a DPFE sensor be cleaned? ›

To clean the DPFE sensor, you must remove it from the vehicle and disassemble it. This typically involves removing mounting brackets and carefully separating the sensor from the EGR valve. Once the DPFE sensor is removed, you can clean it using various methods, depending on the level of contamination.

How do you know if the DPFE sensor is bad? ›

Common signs include engine performance issues like rough idle and decrease in power, failing an emissions test, and the Check Engine Light coming on.

What does a DPFE sensor do? ›

o DPFE (Differential Pressure Feedback Electronic) Sensors are an integral part of the EGR (Exhaust Gas Recirculation) System. The DPFE Sensor provides information to the Powertrain Control Module (PCM) to tell it how much exhaust gas is flowing through the system.

How much does it cost to replace exhaust pressure sensor? ›

The average cost for EGR pressure feedback sensor replacement is between $139 and $148. Labor costs are estimated between $35 and $44 while parts are priced at $104. This range does not include taxes and fees, and does not factor in your specific vehicle or unique location. Related repairs may also be needed.

Does cleaning EGR valve make a difference? ›

Why should you clean the EGR valve? A clean EGR valve can reduce the amount of nitrous oxide emitted from your car. Also, cleaning the EGR valve can help increase the longevity and performance of your car's engine. An unclean EGR valve can damage both your vehicle and the environment.

What happens if DPF pressure sensor fails? ›

When the DPF fails, exhaust gases can not be fully purged as backpressure pushes exhaust back into the combustion chamber causing DPM or soot to mix with the engine oil. Soot is abrasive and when mixed with oil, will cause premature wear to the engine bearings.

What damage can a faulty EGR valve cause? ›

A faulty EGR valve can cause problems with the flow and operation of the EGR system leading to performance issues including a reduction in power, reduced acceleration and decreased fuel efficiency. It can also cause vehicle emissions to increase.

What sensor controls the EGR valve? ›

EGR Fraction Based Control

Critical sensors are an exhaust manifold pressure sensor (P2), an intake manifold pressure sensor (P2) and a speed density estimate of total mass flow. Exhaust and intake manifold pressures are used to control the EGR valve and VGT vanes.

What causes low DPF pressure? ›

A DPF pressure drop increases with increase in the soot mass accumulated in the DPF. Small soot mass accumulation results in lower DPF pressure drop, while high soot mass accumulation would yield higher DPF pressure.

What causes excessive EGR flow? ›

One of the most common culprits here has to do with your car's air filter. An overly dirty filter restricts airflow into your engine, often leading to rich fuel conditions. By replacing your air filter, you should not only restore an ideal air-fuel ratio, but also the problems associated with excessive EGR system flow.

What sensor checks the exhaust gases exiting the vehicle? ›

The oxygen sensor of your car measures the amount of oxygen in the exhaust gasses that exit the engine.

What happens if you don't replace TPMS sensors? ›

For any motorists that swap their tires out for changing seasons, it's crucial that the TPMS sensors are reactivated and recalibrated each time. If this is not done, the vehicle's TPMS will not perform properly and may cause the TPMS light to turn on.

How much does it cost to replace 4 TPMS sensors? ›

TPMS Replacement Costs and What to Expect

In the event TPMS sensors need to be replaced, the cost can range from approximately $50-$100 each depending on vehicle type.

What would causes a DPFE sensor to melt? ›

As the pressure builds up, the engine exhaust temperature rises and will heat us the tubes that the DPFE registers and will cause it to melt.

What is a normal DPF differential pressure? ›

DPF Differential pressure 15.894 kPa / MAF 97.69 gm/sec = 0.163 (DPF = Good).

What does diagnostic code p0401 mean? ›

p0401 Code - Exhaust Gas Recirculation "A" Flow Insufficient Detected | KBB.

What is the best fuel additive to clean the EGR valve? ›

Valvoline EGR Cleaner is an effective cleaning spray used to dissolve deposits in the exhaust gas recirculation valve, air intake system, and inlet valves. It helps maximise engine efficiency, allowing it to run smoother and more optimally.

What happens if the EGR valve is clogged? ›

What happens if the EGR valve is plugged? This type of failure generates a significant loss of power in the engine, jerks or complexity of cold starts, in addition to increased smoke emissions. If the EGR valve remains closed, it will not fulfill its function of reducing pollution.

What happens if you keep driving with a blocked DPF? ›

Don't ignore a warning light

If you ignore a DPF warning light and keep driving in a relatively slow, stop/start pattern, soot will build up in the filter until your car goes into 'restricted performance mode' to prevent damage.

Can DPF cause engine damage? ›

A blocked DPF can lead to a build-up of exhaust gases and excessive pressure which can cause damage to the exhaust system and even to the engine itself. The drive would experience lack of engine performance and in severe cases vehicle will not be able to be driven.

How do I know if my EGR is stuck open? ›

Open Position: Rough idling and problems with acceleration are the two most common indicators that the EGR valve is stuck open. The truck might also stall excessively. When the EGR valve is stuck open, all of the exhaust gas cycle back into the chamber, meaning there's not enough oxygen for a combustion to take place.

What happens when the EGR solenoid valve is activated? ›

When the EGR control solenoid is activated, a passage is opened up that allows exhaust gases into the intake manifold. The EGR solenoid is controlled by the engine computer, and activated at very specific times in order to achieve the best performance, efficiency, and emissions from the engine.

What gas does an EGR valve reduce? ›

EGR systems recycle a portion of the exhaust gas back into the combustion chamber, where it combines with fresh intake air. This lowers the amount of Oxygen and increases the water vapour content to the combustion mixture which reduces the peak combustion temperature.

Does removing EGR increase power? ›

More Power

Removing the EGR valve is going to improve the efficiency and performance of your vehicle and it is going to be a lot more powerful.

How do you clear the DPF in limp mode? ›

If your vehicle has switched to 'limp' mode it will not be possible to regenerate the DPF filter automatically and will need to be professionally cleaned.

Can you drive with a faulty DPF sensor? ›

Driving for short periods at low speed reduces the lifespan of your DPF. It is illegal to drive a diesel vehicle without a DPF or remove the DPF from your car. Driving with a malfunctioning DPF filter may damage your car engine.

How do you clear a blocked DPF filter? ›

The easiest and cheapest method of DPF filter cleaning is by driving the vehicle for a long-distance at high revs per minute. Doing this increases the heat of the exhaust and burns the soot blocking the DPF filter. It's best to drive on a motorway or A road where you can keep the vehicle at a consistent speed.

Does idling cause DPF filter issues? ›

REDUCE IDLING

Even at low engine speeds particulates are emitted by your engine, so keeping your engine ticking over when you're parked or not moving can clog your filter quicker, because DPF regeneration cannot occur at idle.

Can blocked DPF cause rough idle? ›

When an EGR valve becomes clogged or stuck close, it can increase the amount of diesel soot passed on to the DPF, contributing towards faster blockage. A clogged EGR valve alone can cause a rough idle and heavy knocking, both of which are tell-tale signs of pre-detonation.

Can a blocked DPF cause back pressure? ›

A blocked DPF prevents exhaust gas passing through the exhaust system at the required rate. As a result back pressure and exhaust gas temperatures increase within the turbine housing.

Does EGR damage engine? ›

So not only does EGR hamper performance by coating and then shrinking the size of the intake path, but it is also hard on engine oil, and even degrades the coolant that is used to cool off the exhaust gases passing through the EGR cooler.

Can a clogged EGR cause rough idle? ›

An EGR valve that is stuck open can result in a fuel-air mixture that is too lean. This can cause a rough idle.

Does EGR valve affect idle? ›

Engine performance issues: if the valve is stuck open the vehicle's air-fuel ratio will be disrupted causing engine performance issues such as reduced power, poor acceleration and rough idle.

Which sensor is screwed into the exhaust system? ›

The oxygen sensor is made of ceramics and includes a number of pores, which are electrodes coated in platinum and surrounded by a threaded casing. The sensor is effectively screwed into the exhaust pipe with half of it sticking out.

How much does it cost to fix a car sensor? ›

Total Cost

Many sensors, nonetheless, cost between $20 and $100. Your mechanic's labor costs also likely vary based on a few factors, including how difficult it is to access your sensors. Typically, labor costs for a sensor replacement are around $150.

Is it worth it to replace TPMS sensors? ›

A: Tire pressure monitoring sensor batteries are designed to last 10 years. It sounds as though yours may have died. The law does not demand that you replace the sensors, but for your peace of mind, convenience and safety's sake, it makes sense to replace them.

Can I disable my TPMS sensors? ›

Yes, there is a sophisticated yet non-invasive method of disabling your tire pressure monitoring system. All you have to do is use an emulator designed to bypass the TPMS. The TPMS bypass emulator is a small box-like device equipped with technology to “turn off” your tire pressure monitoring system.

How much does it cost to replace all tire pressure sensors? ›

Therefore, it is always the best choice to get help from a technician to replace the sensor, so it fits perfectly. On average, you will have to spend between $30 to $75 for a sensor and around $10 to $35 in labor costs. Thus, the average cost of replacing a tire sensor can cost between $40 and $100.

Does Costco replace TPMS sensors? ›

The Costco Advantage

These Lifetime services include inflation pressure checks, tire balancing, tire rotations, as well as flat repairs. Upon the service of your tires we also install new rubber valve stems (Note: TPMS valve stems and accessories will be an additional charge).

How much does it cost to recalibrate a TPMS sensor? ›

The average cost for tire pressure monitoring system relearn is between $35 and $44. Labor costs are estimated between $35 and $44. This range does not include taxes and fees, and does not factor in your specific vehicle or unique location. Related repairs may also be needed.

Can a tire shop replace TPMS? ›

Sometimes, a TPMS alert means one or more of the TPMS sensor batteries has died. In this situation, you may need to replace the TPMS sensor. All of our store locations can perform these replacement services for you.

Does EGR cleaner clean DPF? ›

This powerful all-in-one cleaner removes deposits and other dirt residues from the turbo, injectors, EGR valve, particulate filter (DPF) and the inlet and outlet valves. You can easily add this EGR cleaner to the fuel tank yourself.

Can you clean a EGR sensor? ›

To clean the valve, wear an acid-resistant pair of gloves. Put on safety glasses, too, as the carbon deposits could become airborne in the process. Spray the EGR valve cleaner onto the carbon deposits. Remove the carbon buildup with the use of a pipe cleaning brush and dull scraper.

How do I know if my sensor needs to be cleaned? ›

Make sure that your focus is way off (completely out of focus) – that way only dust particles will be visible. Zoom in on the image (rear camera LCD), scroll from left to right and top to bottom all over the image and see if you can find any dark spots. If you cannot see any, your sensor is clean.

Can you clean a map sensor without removing it? ›

Use an electric parts cleaner on a soft rag or paper towel to clean the outside of the MAP sensor. Spray the electric parts cleaner into the sensor port — a couple of spritzes are usually sufficient. Shake out the excess and let the MAP sensor dry.

How much does it cost to clean a DPF system? ›

Factor in downtime for cleaning DPFs and replacement costs can range between $2,500 to $8,000 per vehicle. With these potential costs directly impacting every diesel-powered vehicle operator's bottom line, cold starts are a hot topic within the commercial vehicle industry.

How do you completely clean a blocked DPF? ›

DPF regeneration – a DPF regeneration is the straightforward process of driving your vehicle at higher-than-normal revolutions per minute (RPM) for at least 30 minutes. In doing so, you're given your vehicle a chance to sustain optimum operating temperatures which help to burn any blockages.

Can a blocked DPF damage the engine? ›

Blocked DPFs wreak havoc with the delicate balance of your engine by preventing the normal venting of gases, which causes a variety of engine issues, as described above. In addition to reduced power and fuel efficiency, a blocked filter may eventually cause a dangerous mechanical malfunction and break your engine.

What problems can a blocked DPF cause? ›

A blocked DPF can cause severe damage to your engine. This is because your engine is having to work a lot harder to vent the exhaust fumes that your blocked DPF is failing to. This can lead to weakened acceleration, increased fuel consumption, and the risk of leaks.

Can the MAF sensor cause DPF issues? ›

It could be faulty and still working but not correctly. By sending the incorrect data to the ECM, generating more PM / carbon, stopping the DPF regeneration process, could result in a blocked DPF. The MAP/MAF sensor is an essential part in delivering the correct fuel/ air mixture to the engine.

What problems can a DPF cause? ›

It's very important to keep your DPF as clean as possible because a clogged DPF can cause motor and turbo failures due to an increase in back pressure which will also decrease fuel efficiency as well. Common Causes of DPF Failure: city driving/idle hours. not getting up to operating temperatures.

Can a dirty air filter cause EGR problems? ›

An overly dirty filter restricts airflow into your engine, often leading to rich fuel conditions. By replacing your air filter, you should not only restore an ideal air-fuel ratio, but also the problems associated with excessive EGR system flow.

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