Q: Check Engine light comes on and goes off 2005 Volvo S40

asked by on

My Volvo has a check engine light for fuel rail pressure. Volvo dealer has changed 3 parts in fuel system and now says problem is fuel pump. Car gets good mileage and has no drivability issues. Light comes on for 1-3 days and goes off by itself.
Any idea if it is really the fuel pump, wiring, or what?

My car has 125000 miles.
My car has an automatic transmission.

Hi there - without knowing whether the fuel pressure problem is "pressure high" or "pressure low", it would be speculating as to what component may be malfunctioning. Get the problem codes turning the Check Engine light on. For the fuel pump to be the problem, the symptom would pretty-much have to be low fuel pressure. Low fuel pressure could be caused by a worn fuel pump, clogged fuel filter, or inadequate electrical power to the pump - possibly from a fuel pump relay with burned contacts. Get the actual codes which are causing the Check Engine light - then you aren’t guessing as to the problem. I recommend a fuel system inspection performed by a mobile, professional mechanic, such as one from YourMechanic, who will come to your location, diagnose this problem, and give you an accurate assessment of damage and cost estimate for repairs.

Was this answer helpful?
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
  1. Home
  2. Questions
  3. Check Engine light comes on and goes off 2005 Volvo S40

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: Temperature gauge arrow climbs high, then returns to normal

There is a cooling fan clutch mounted on the radiator, and this device will move air across the radiator to cool the liquid coolant inside. The water pump is responsible for getting the coolant where it needs to go. With...

Q: Heat not working in 2005 chrysler pacifica.

Hi there. It's possible that a failure in the thermostat (on the radiator) could cause a heater malfunction; but it would also impact the vehicle's overall cooling system and overheat your vehicle. It's more than likely that you're having an...

Q: Diagnostic code read o2 sensor bad, replaced o2 sensor, cleared code but engine light came back on, is it caused by bad air filter

Hello there. Typically jump starting a vehicle doesn't trigger an OBD-II error code. However, one of the most common misdiagnosis issues with the P-2270 is replacing the O2 sensor before diagnosing if there are any exhaust leaks. Obviously, you'll want...

Related articles

How Long Does a Distributor O Ring Last?
The distributor is part of the ignition system in your vehicle and its purpose is to route high voltage from the ignition coil to the spark plug. The spark plug then...
What are the Car Pool Rules in Hawaii?
Hawaii is widely regarded as a land of vacation and relaxation, and as such, its scenic roads and routes are far better known than the state’s freeways. But, as with all...
P2103 OBD-II Trouble Code: Throttle Actuator Control Motor Circuit High
P2103 means there is a fault with the throttle actuator control motor circuit, likely due to a defective electrical component or part.