Symptoms of a Bad or Failing Fuel Rail Sensor

The fuel rail sensor, commonly referred to as the fuel pressure sensor, is an engine management component that is commonly found on diesel, and some gasoline injected vehicles. It is a part of vehicle’s fuel system and designed to monitor the fuel pressure that is present at the fuel rail. The sensor sends this signal to the computer, which then uses it to make adjustments to the vehicle’s fuel and timing. When the sensor has an issue it can cause problems with the performance of the vehicle. Usually a bad or failing fuel rail sensor will produce a few symptoms that can alert the driver to a potential issue.

1. Hard starting

One of the first symptoms of a potential problem with the fuel rail sensor is hard starting. A faulty fuel rail sensor may send an inaccurate signal to the computer which may cause the engine to experience hard starting. The engine may take a few cranks longer than normal to start and in more serious cases may not start at all.

2. Decrease in power, acceleration and fuel efficiency

Another symptom of a potential problem with the vehicle’s fuel rail sensor is engine performance issues. A faulty rail sensor may upset the air fuel ratio and cause the vehicle to experience performance issues such as a decrease in power, acceleration, and fuel efficiency, and in some cases may even experience stalling.

3. Check Engine Light comes on

An illuminated Check Engine Light is another symptom of a potential problem with the fuel rail sensor. If the engine computer detects an issue with the fuel rail sensor signal or circuit, it will set off the Check Engine Light to notify the driver of the issue. The Check Engine Light can also be activated by a wide variety of other issues, so having the computer scanned for trouble codes is highly recommended.

While fuel rail sensors are not found on all vehicles, to the ones they are found on, they play an important role in engine management functions. If your vehicle is displaying any of the symptoms above, or you suspect that your fuel rail sensor may be having an issue, have the vehicle diagnosed by a professional technician, such as one from YourMechanic, to determine if the sensor should be replaced.


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Eduardo

19 years of experience
549 reviews
Eduardo
19 years of experience
Jeep Cherokee L4-2.4L - Car is shaking or vibrating Inspection - Houston, Texas
Very prompt and knowledgeable
Ford Explorer - Car is not starting - Houston, Texas
Love your professionalism, very punctual and quick. Will use u and recommend u to others!!!

Michael

4 years of experience
230 reviews
Michael
4 years of experience
Volkswagen Jetta L5-2.5L - Fuel System Inspection - Indianapolis, Indiana
professional ,informative and knowledgeable

Kenneth

20 years of experience
775 reviews
Kenneth
20 years of experience
BMW X5 L6-3.0L - Fuel System - Rancho Palos Verdes, California
Kenneth was extremely knowledgeable. He correctly diagnosed my vehicle by actually going under the hood, removing a section and running some sort of test that told him exactly what the problem was. He also arrived 15 minutes early and had prepared for the visit by contacting me the day prior to get further clarification.

Johnny

33 years of experience
264 reviews
Johnny
33 years of experience
Toyota Corolla L4-1.6L - Fuel System Inspection - Sacramento, California
Johnny did a great job

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