Thread: P0401 AGAIN! Help

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  1. #1 Re: P0401 AGAIN! Help 
    GT Level Member 94GrandPrixSE's Avatar
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    Quote Originally Posted by BillBoost37 View Post
    The code comes up after long amounts of time, because you didn't read up on it. Sorry..had to toss a little humor in.

    It's based on how the test runs, when it runs etc.

    Well I replaced the MAP sensor wont know if it fixed it for a while, ill re post if i have anymore problems thanks again guys!
    02 GTP - Cartuning Turbo Kit VS67 3" DP, 80#INJ, N*,LQ4 MAF, Custom Cam, Roller Rockers, 130#, P&P Heads, Meth, AL103's, Corn fed, 522WHP on a mustang dyno, HP Tuners by me.
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  2. #2 Re: P0401 AGAIN! Help 
    GT Level Member 94GrandPrixSE's Avatar
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    2 weeks later light is back on anyone know what my next step should be?
    02 GTP - Cartuning Turbo Kit VS67 3" DP, 80#INJ, N*,LQ4 MAF, Custom Cam, Roller Rockers, 130#, P&P Heads, Meth, AL103's, Corn fed, 522WHP on a mustang dyno, HP Tuners by me.
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  3. #3 Re: P0401 AGAIN! Help 
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    I am having the same issue. 2000 GTP 93K Miles. Things that have been replaced so far are the Aft O2 sensor, MAP sensor, PCV valve, removed and cleaned throttle body and all lines and replaced EGR. The EGR was a cheap one from E-Bay which may still be the problem. It is going in for a scan on Saturday.

    I have read that if all else fails, the PCM may have to be flashed because the parameters will change over 16 years. Anyone have any insight on this?
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