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Here almost 10 years later, I relocated (extended my rear o2 harness) and installed a cat after my header on a 2000 g20. I'm always getting p0138, sometimes it stays off for a few days, but typically always comes back.

The car isn't worth any money at this point, but I do need to pass emissions soon, going to give this a try.
 

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Premium Member
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P0138 still would come on then go off every couple cycles. Finally took the plunge today and wired the 1.2k ohm resistor into the signal wire (rear o2) and cleared my code. Also running a 16.9k ohm resistor in the plug (series wired) of the egr temp sensor harness.

Car is just too old, and emissions parts are too expensive to try to salvage on this car. Going to give it a few weeks, and see if the ecu is willing to cooperate, state of Illinois is hitting me with an emissions test every year, February is coming up fast for this car.
 
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