Running Rich Bank 1 After Mods..
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This is a discussion on Running Rich Bank 1 After Mods.. within the Engine Modifications forums, part of the Tech & Modifying & General Repairs category; I have an 2002 WRX and I added a turbo back exhaust and a K & N and purchased the ...

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    Running Rich Bank 1 After Mods..

    I have an 2002 WRX and I added a turbo back exhaust and a K & N and purchased the Cobb Tuner,after the mods I am getting check engine light "Running Rick Bank 1" I replace the o2 sensor i have checked for leaks in the exhaust. I unmarried the Tuner and it still comes up with the code. Any help?

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    Registered User Pylonpounder's Avatar
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    well, what K&N? A drop in filter is useless, and a CAI or short ram on 02-03 wrx's will cause running issues. See, here's the thing. Our engines are controlled, in part, by the MAF, or Mass Airflow Sensor. This is specifically calibrated in regards to intake diameter, blah blah blah. You change the amount of air flowing through- by, say, putting on a new air intake- and the computer has NO idea how much air there is, so it can't add the proper fuel. Plus, the Cobb AP only functions with the AEM and Cobb intakes.

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    Great I will try putting my old air cleaner system back

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    Registered User Pylonpounder's Avatar
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    Best of luck. If that doesn't solve it, perhaps putting it back to cobb stage II will get rid of the cel, since you still have the mods for that

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    He simply abides. SD_GR's Avatar
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    Quote Originally Posted by miasdad02 View Post
    Any help?
    Only if the actual code is PO172, bank 1 rich. If so:

    There is only 1 bank.
    The O2 sensor is the first thing implicated but I doubt it's even remotely near the top causes.
    Treat it the same as a PO171, and troubleshoot accordingly.
    Check for intake leak. This includes all boost hoses and the BOV -- the BOV if present is by definition an intake leak, incidentally. If the correct valve is missing, suspect.
    Check for a vacuum leak.
    Check the reference line to the fuel pressure regulator.
    Check the intake itself, the filter, and the MAF. If any of these are not the correct part, suspect.

    EDIT: Got a sense of deja vu, here's a previous thread, hope it helps:
    P0172 help!!!!!
    Last edited by SD_GR; 09-22-2011 at 05:13 PM.
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