Is your car throwing codes or are you having a hard time passing your state or county emission test? Ask how to fix it here.
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Post by thy_2003sxt4 » Sun Nov 10, 2013 10:53 pm

Its been brought up before...
I have a TTi LT header installed on my 03 sohc. I have the upstream o2 sensor installed, but unclipped the downstream. The cel for p0038 shows up for basically having a bad/no cat. Will not having the downstream plugged in harm anything on my car? I.e. mpg or engine wise?

O2 Sensor 1/2 Heater Circuit High

occasional demons
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Post by occasional demons » Mon Nov 11, 2013 7:59 am

That is the code for the 1/2 o2 sensor circuit. If you plug it back in, you will get the code for a bad converter. You could try the non fouler for spark plugs trick. It is hit and miss.

IIRC, the 1/2 sensor is used for long term fuel trims. How much this impacts an NGC car, I have no idea.
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2000 Neon MTX swap with '02 R/T PCM
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