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Old 05-01-2019, 01:23 PM   #23
Cougar4
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Member#: 53443
Join Date: Jan 2004
Location: Anchorage, AK
Vehicle:
2001 LL Bean Outback
Winestone

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So far we haven't been able to find out what is causing the problem, even while doing some good logical testing. Just out of curiosity, I wonder what the rear O2 sensor heater circuit is doing. Can you check the voltage on the ECU pins that control the return circuit for that sensor and see if that one is working the same way as the front one is?
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Last edited by Cougar4; 05-01-2019 at 01:29 PM.
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