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Uploaded on Sep 5, 2011
My truck recently turned on its "service engine soon" light, and a check of the codes revealed a P0155 (bank two, oxygen sensor 1 heater fault) had been set. The code returned right away while the wiring looked good, so I knew the sensor had to be faulty. Replacing it solved the problem.
Despite what was said in the video, I don't think this truck has a post-catalytic converter oxygen sensor. Some vehicles do.