Mutiple CEL's, help me diagnose!
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This is a discussion on Mutiple CEL's, help me diagnose! within the General Maintenance, Troubleshooting & Accidents. forums, part of the Tech & Modifying & General Repairs category; I've been driving around with a CEL for a few weeks now, and after having the codes pulled (P0103, P0031 ...

  1. #1
    Registered User muddyrex's Avatar
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    Mutiple CEL's, help me diagnose!

    I've been driving around with a CEL for a few weeks now, and after having the codes pulled (P0103, P0031 (x2), and P0244) I replaced the front A/F sensor yesterday and cleaned the MAF with some MAF cleaner. The CEL went off after startup, but after driving back and forth to work today it seems that I've got something else going on.

    Here's what's showing now.

    P0103 Mass air flow sensor circuit high input
    P0136 Rear oxygen sensor circuit malfunction
    P0031 Front oxygen (A/F) sensor heater circuit low input
    P0244 Wastegate control solenoid valve malfunction (high input)
    P0136 Rear oxygen sensor circuit malfunction

    02 WRX with 152,000 mikes. Mods - HKS catless downpipe and catback, STi topmount, MBC, short ram intake, lightened crank pulley.

    Help is appreciated.

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  3. #2
    Registered User EvoEatr's Avatar
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    02 Sensor codes-..the rear sensors rarely go bad on these cars however with that mileage anything is possible..I'm pretty sure I've seen that P0136 code get thrown from the catless DP/catback...So what your saying the only Cat conv. that is on the car now is the one in the up pipe? Did you Clear the memory in the ECM after your replaced the front sensor? Did you happen to buy an OEM sensor? I would inspect the sensor and harness and make sure no terminals are backed out or loose wires..Also clear the memory if you didnt before...
    Wastegate code- This could easily be thrown by the MBC if you have rerouted vacuum lines to support the MBC..
    MAF- This could be thrown due to the SRI...Again did you clear the code after you cleaned the sensor? Is this an oil type filter element? A quick test of the MAF sensor itself is..with the engine running take the butt end of a screwdriver and tap on the sensor a tad..if the car stumbles or dies..chances are the sensor is defective...

    Do you have any driveability problems such as idle, power loss etc etc ???

  4. #3
    Registered User muddyrex's Avatar
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    The rear 02 sensor shoudln't be throwing any codes since I'm using an electrical CEL fix there. I did reset the ECU after replacing the front A/F sensor in the headers. It was a Subaru OEM sensor, and all connections seem to be fine. It is an oiled filter on the SRI, but i've been running this way for MANY miles without issue.

    No driveability issues. Idle is fine, spools fine, powerband feels no different, and runs fine at start up. Aside from the CEL, the car feels fine.

  5. #4
    Registered User EvoEatr's Avatar
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    What are you tuned with?

  6. #5
    Registered User muddyrex's Avatar
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    No tune. Stock EM. MBC to 16psi.

    I know, I know......

  7. #6
    Registered User EvoEatr's Avatar
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    I think you've found your answer...Either turn it all back to stock and erase the codes or get a tune with the current aftermarket parts you have installed...

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