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P0161 check engine light
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<blockquote data-quote="raptorbone" data-source="post: 1600822" data-attributes="member: 12029"><p>Correct, the PCM monitors the health of the O2 sensor heater as a function of voltage. The above post does not address the power source, which, according to the wiring diagram, is the PCM. If you can find something otherwise, we would appreciate seeing it. In my case, I found increased resistance to ground through the common wire when comparing bank 1 and 2 circuits, so I'm still holding out hope it's a circuit fault in the harness.</p><p></p><p>Impedance is incorrectly used though; applies only to AC circuits.</p></blockquote><p></p>
[QUOTE="raptorbone, post: 1600822, member: 12029"] Correct, the PCM monitors the health of the O2 sensor heater as a function of voltage. The above post does not address the power source, which, according to the wiring diagram, is the PCM. If you can find something otherwise, we would appreciate seeing it. In my case, I found increased resistance to ground through the common wire when comparing bank 1 and 2 circuits, so I'm still holding out hope it's a circuit fault in the harness. Impedance is incorrectly used though; applies only to AC circuits. [/QUOTE]
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