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25/02/2021 4:01 pm
Topic starter
2004 GMC Yukon XL 1500 195000 miles 503 L Flex Fuel Code P0161 O2 Heater Circuit (Bank2 Sensor 2) Should i replace both down stream O2 sensors and or all four that my vehicle has or just replace the one that is acting up.
Thankyou
1 Answer
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25/02/2021 4:04 pm
I would test it to make sure the problem is actually the sensor, and then I would just replace the one.
https://www.youtube.com/watch?v=M55qmlHZmko
