Hummer H3 o2 oxygen sensor p0420 Catalyst System Efficiency Below Threshold (Bank 1)
51,615
Published 2015-07-17
All Comments (10)
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Just an FYI I just spent about 300 dollars trying to fix this code... What was going on is the wire that heats the O2 sensor to normal operating temp wasn't working. So after literally replacing everything including O2 sensors and catalytic converter/headers... I found out the O2 sensor connector was bad. It was burnt and some wire was showing but I never saw it since it was more inside of the connector from the engine harness.
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He made that look so easy and so simple.
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Great Video! Thanks
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Does the code come back after a while? I have a two year old catalytic converter and now I have the same code as you. I also consider to change the O2 sensor first because I guess the O2 sensor is not working properly (o2 sensor is also two year old now).
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Legend
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I changed the one that is in the trunk... But I still have the problem after the reset on the computer (it went on again after 10 miles)... Any ideas?
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то что нужно!!!
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i have oxygen sensor light and cam shave sensor and krank shave sensor and selenoid in gear box
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well theres your problem your steering wheels on the wrong side!
