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Old 10-25-2008, 09:14 PM   #1
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P0031 after resetting PCM :-(

I had a CEL p0037 since i gutted my cat and added a wideband.

But just yesterday i took off my pulley kit and installed my Injen intake and put OEM pulleys back on. I got in my car turned ignition on (not starting car) and press brake 20times rapidly oil pressure sweeped half way.

Well after i did that i noticed my AFR changed to being really rich. before i installed and cleared the PCM my aft wher just right around 15.0 crusiing now there in the 11 and 12's.

why would it do it right after i resetted my PCM.????

can anyone help?
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Old 10-25-2008, 09:17 PM   #2
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I don't know why it would do it, but it means your front O2 sensor is bad
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Old 10-25-2008, 11:22 PM   #3
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Resetting the PCM (brake pedal) resets the fuel trim.
Give it a few drive cycles and see if it goes back to what it was.
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Old 10-25-2008, 11:22 PM
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