This is my first post and I will start by saying, I know nothing of Volvos. This is for a friend of mine. She will be leaving tonight, headed for Texas. She didn't ask me to look at her car until yesterday afternoon.

I have access to a Solus and Mitchell, but I have to use the Global OBD-II to pull codes, since the Solus doesn't have a Volvo specific menu. There were two codes present:

P0089 Fuel Pressure Regulator 1 Performance
P0172 System too Rich (Bank 1)

Now, from past experience, I know that the P0172 can be caused by a faulty FPR, fuel pump and on occasion a bad vapor canister.

I have searched this forum since last night and cannot find anything pertaining to these two codes at the same time. If I knew what the specs for the fuel pressure is supposed to be, I could test is and better diagnose the problem instead of just throwing parts at it.

I understand these cars frequently have issues with faulty FPRs and if anyone knows of another way to test it, I would greatly appreciate it.

There is also a whining noise from under the back seat, which may be the fuel pump, but again, I am all ears.

I appreciate any input.

 

Did you ever get this resolved? I'm having the same combination of symptoms with my 2005 S40.

 

Have you checked your fuel pressure?

 

That seems like the thing to do but I don't have anything to measure that with.

 

Harbor Freight sells a cheap one for about $20.
Fuel Pressure Tester & Fuel Injection Pump Tester

 

Thanks, Hudini

 

Hudini, a friend of a friend of a friend had one and tested my fuel pressure. It was reading only 9psi. I've replace the pressure sensor and that seems to have done the trick. thanks for pointing me in the right direction.

 

Good to hear you fixed it.