Good evening.

I have a 2006 Volvo S40 2.4i.

Been having a problem for a bit of time now that I can't nail down. My check engine light came on. The codes pointed to the Fuel Rail Pressure sensor. I replaced the sensor and the code cleared. However I then started getting a code for Bank 1 running rich. I replaced the PCV Oil Trap. Still the same code.

With the code I'm also getting a "whining" noise from the rear of the vehicle. Volvo mechanic indicated it was the fuel pump. So... replaced the fuel pump. Still getting the code and still have the noise.

Can anyone give me any idea what could be causing this? What else could I do to get rid of the code. What about the noise? What could/might that be?

Thanks for any opinions/info/help.

 

First thing I would do is put the old fuel pressure sensor back in to see if anything changes. I'd also put my fuel pressure tester on it to check.

Then if nothing changes I would suspect the top O2 sensor, especially if the sensor has more than 100k miles on it.

Last I would get up under the car with it securely on jackstands and see if I can't pinpoint that noise. A cheap mechanic's stethoscope will help here. A cheap work around is to use a rubber hose held to your ear. Move it around to try and pinpoint the noise under and around the car.

 

Hudini is your man - follow his instructions and you can't go wrong.

 

Hudini rocks this Forum. Know his Volvos.

 

Hi Bigc55,

I am having the exact same issue you described. Have you found a solution for the problem?

 

Still have the problem. Wife not happy. Have pretty much replaced everthing i can think of (except the fuel filter and gas vent hose)

Any additional thoughts?

thanks.

 

Could it be a ruptured vacuum hose? Might want to try a smoke test to verify.

 

Does the S40 have a vacuum line that runs back to the evap cannister (or what ever its called)? Wondering if the emissions pump could be buzzing as a result??