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Old 03-21-2005, 11:28 AM   #1
doghouse
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Join Date: Mar 2005
Default P0031-->Front O2 Heater Questions

Hello. I have a '97 Outback into which I have transplanted a '02 WRX motor. I've got about 40k miles on the setup and only now have gotten around to hooking up the OBDII and reading the codes. I have several, some which I am aware of, and some which puzzle me. There was no fuel tank pressure, temp, or level sensor or fuel pump controller circuit in the Outback, so all those codes are present (any ideas how to "fake" those?). But the one that really puzzles me is the P0031 --> Front O2 Heater Circuit. I've checked all the wires going back to the ECU, checked for proper voltage and grounding of the circuit, and even tried three different O2 sensors. All to no avail. Any ideas? Thanks.
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