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OnlineHelp
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soul: & p0174..maf sensor, but I still have the same code..fuel pump

Resolved Question:

I have a 2001 Type S, I had a Code of PO171 & P0174, I change the MAF sensor, but I still have the same code, I need to know the pressure the fuel pump sould be putting out, and any other ideas
Submitted: 8 years ago.
Category: Car
Expert:  OnlineHelp replied 8 years ago.

Hello and thank you for choosing Just Answer.

Those two codes mean the car is running lean (more air than fuel) you need to check the fuel pressure (which you are doing), if the fuel pressure checks fine you need to look for vacuum leaks. A common place to look would be the intake manifold gasket and the throttle body gaskets.

The fuel pressure should be at 45 psi when the key is at ON, then it should go down to 38psi when the car is turned on. Give or take 2PSI.

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