DPFE Sensor Meaning, Function, Symptoms & Diagnosis

by Joshua Thomas

Advancement in automotive engineering technology has brought significant changes in vehicle design and development.

The modern car engine tends to be quite complex. The engine has numerous parts and electronic sensors that enhance higher performance.

Some of the key components of a modern engine are the EGR valve and DPFE sensor. These premium parts determine the amount of emission and fuel combustion of a car.

The crucial role of a DPFE sensor is to monitor the pressure changes of the EGR system. Besides that, it works together with an EGR valve.

However, many car enthusiasts have little clue about the meaning and operation of a DPFE sensor. The good news is that the article got your back.

We've done thorough research on the meaning, function, symptoms, and how to fix a bad sensor. Take the time to read through the guide for further insight.

DPFE Sensor Meaning, Function, Symptoms & Diagnosis
DPFE Sensor Meaning, Function, Symptoms & Diagnosis

What Is a DPFE Sensor?

The Delta Pressure Feedback in an EGR system is abbreviated as DPFE. It is an electronic sensor responsible for monitoring the number of emissions sent back in the combustion system.

It communicates with a powertrain control module to ensure all the gases being sent back are completely burnt.

The main aim is to ensure all the vehicles released in the market comply with Exhaust Gas Regulations. Besides that, it helps minimize the emission of nitrogen oxide in the atmosphere.

How Does a DPFE Sensor Work?

Delta pressure feedback sensor is part of the exhaust gas recirculation system. The key function is to monitor and measure pressure in the EGR system.

The electronic sensor tends to work by converting the output pressure into an analog signal. It then communicates with the computer system for the calculation of optimum EGR flow.

The EGR system starts sucking unburnt gases from the combustion system into the engine for reburn. The research shows that the sensor tends to work the same way as a turbo system.

The main aim of the process is to reduce the amount of nitrogen oxide in the atmosphere. Hence, reduce the rate of ozone layer depletion and environmental pollution.

What Happens When the DPFE Sensor Fails?

Scheduled car maintenance is quite important. It helps reduce the chances of premature failure of vital components, especially in the engine.

The critical role of a DPFE sensor is to provide accurate readings to the EGR system. A bad electronic sensor will automatically send the wrong information to the EGR.

Therefore, the wrong signals will force the EGR system to provide inaccurate information. This will later make the PCM valve fail in carrying out its purpose.

The PCM valve helps to control the amount of air to be added to the fuel. The improper function will trigger the production of a lean mixture of air and fuel.

What Are the Symptoms of a Bad DPFE Sensor?

A failed delta pressure feedback sensor tends to produce few symptoms that can alert the driver of the potential problem. Immediate correction helps improve the performance and lifespan of the engine.

Here are some possible symptoms of a bad delta pressure feedback sensor that you may need to know. They include:

Engine Performance Problems

Issues related to engine performance is one of the first symptoms associated with a bad DPFE sensor. The sensor tends to send inaccurate information to the computer system that makes the EGR system malfunction.

A malfunction EGR system results in engine performance issues such as rough idle, reduced power, and overall fuel efficiency.

Failed Emission Tests

If your vehicle experiences a failed emission test, then there is a problem with the DPFE sensor. The issue occurs due to a malfunctioning EGR system.

All states in the USA require vehicles to pass emission tests before registration. It is one of the initiatives to conserve the ecosystem.

Check Engine Light Comes On

The issue occurs when the computer system detects a problem linked to the EGR pressure sensor signal. The check engine light usually alerts the driver.

You will be expected to troubleshoot the engine and identify the source of the problem. The good news is that the cost of diagnosis and fixing is quite affordable.

How to Diagnose and Fix Failed DPFE Sensor

Delta pressure feedback sensor is a crucial component of an EGR system for vehicles. It provides signals that the EGR system uses to function. A malfunctioning EGR system occurs due to wrong signals sent by the sensor.

The most exciting thing is that the problem can easily be tested at home. But you need to know the car engine.

The knowledge will help you identify the EGR pressure sensor and troubleshoot the problem. Here are the tips on how to fix the DPFE sensor:

Open the Hood of the Vehicle

Opening the hood will help to identify the EGR pressure sensor. It is normally located near the EGR valve behind the intake manifold.

However, the sensor's location tends to vary depending on the make and model of the vehicle. The component is a small square with two vacuum hoses on the bottom and a wire harness coming out of the side.

Check the Vacuum Hoses

Give the vacuum hoses a firm tug for easy disconnection. Check if there are any cracks between the EGR and electronic sensors. A crack or broken vacuum hose may need replacement.

Check the Wiring

The use of a multimeter does the wiring check. It helps to measure the signal, ground, and voltage.

The occurrence of P1400 or P1401 error codes is dual to signal or ground, ranging from 0.2 to 4.8 volts. It is a clear indication that the sensor is faulty and needs replacement.

Check the EGR Valve

Faulty EGR valves occur due to blockage of the hoses. It is advisable to check the EGR valve thoroughly and identify the source of the problem.

How Much Does a DPFE Sensor Cost?

Failure to fix a bad DPFE sensor will make your vehicle not to pass the emission test. Besides that, it will shorten the lifespan of your motor engine.

Tricking the engine system to work perfectly will lead to legal problems in the long run. It would be best if you were quite careful when diagnosing and fixing the delta pressure feedback sensor.

The cost of replacing the electronic sensor is quite affordable. But the price tends to vary depending on the brand and model of your vehicle.

The average cost of DPFE sensor replacement ranges from $50 to $500, including the labor. The good news is that all these activities can be done at home to cut down on the cost.

There are many brands of delta pressure feedback sensors in the market. The Auto Parts Prodigy EGR pressure sensor is the most popular and easy to replace. It has unbeatable performance and available on Amazon ( Check Here the Price).

Final Thoughts from Experts

Routined vehicle maintenance tends to foster durability and performance. The automotive DPFE sensor is one of the engine components that need to be monitored.

Proper functioning EGR pressure sensors help to reduce the emission of nitrogen oxide into the atmosphere. Hence, enhance environmental conservation by facilitating complete fuel combustion.

Therefore, take immediate action when you suspect any engine malfunction. The most compatible DPFE sensor for ford vehicles is Allmotorparts EGR Pressure Sensor ( Check Price on Amazon).

About Joshua Thomas

Joshua Thomas just simply loves cars and willing to work on them whenever there's chance... sometimes for free.

He started CarCareTotal back in 2017 from the advices of total strangers who witnessed his amazing skills in car repairs here and there.

His goal with this creation is to help car owners better learn how to maintain and repair their cars; as such, the site would cover alot of areas: troubleshooting, product recommendations, tips & tricks.

Joshua received Bachelor of Science in Mechanical Engineering at San Diego State University.

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