Car running lean

2004 ACURA TL

166,800 MILES

MANNY5590

MEMBER
1 POST

I was driving the other day and my check engine light came on. i have a scanner and scan it got p0174 and p0171 codes. I cleaned the MAP sensor with a cleaner, light kept away for two days came back with p0174 and p2237. any help? here is my freeze frame. i forgot to add that my mechanic was doing some work on my car and he saw the code, he put a new oxygen sensor but i think that didn't fix the issue

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Mar 17, 2019 at 12:49 AM

SCGRANTURISMO

✓Experienced Mechanic
4,897 POSTS

Hello,

There are a few things that can cause these DTC's to set. A failing fuel pump not delivering adequate fuel pressure, An intake air leak letting in unmetered air, that is any air that enters into the combustion chambers past the MAF Sensor, or in your vehicles case after the MAP sensor. There really is no way to pin down what the problem is without going through a process of elimination.
Fortunately, we have the factory troubleshooting guide for both DTC P0174 and P2237 for you in the diagrams down below. In the guide it talks about using your HDS. This is a tool that Honda/Acura dealership Techs use. You should be able to do the same thing with a code reader. Please go through these two guides and get back to us with what you find out.

Thanks,
Alex
2CarPros

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