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P0161 check engine light
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<blockquote data-quote="raptorbone" data-source="post: 1600555" data-attributes="member: 12029"><p>I'm having the same issue and have been for more than a year. Doesn't affect drivability but I can't get it inspected in TX.</p><p></p><p>I have done the same things as you. I also flashed the PCM, left for a week battery unplugged, and cleared the code with tuner. Code always comes back.</p><p></p><p>From the old O2 sensor, cut off the harness and connect to the truck's harness. Measure the DC voltage across the O2 sensor heating element leads. I believe it's the two white wires (please confirm; black and gray are for the sensor, I believe). Should read greater than 12V.</p><p></p><p>When I did this, I measured 12V on the passenger and 10V on the driver. Bad news...the O2 heater is driven by the PCM, not the fuse block. I still need to test continuity to the PCM through the harness. I think it may be a bad ground reducing the voltage. If not, I will have to go to the next step and replace the PCM. All over something that does nothing other than make the government happy.</p><p></p><p>Let us know what you find.</p></blockquote><p></p>
[QUOTE="raptorbone, post: 1600555, member: 12029"] I'm having the same issue and have been for more than a year. Doesn't affect drivability but I can't get it inspected in TX. I have done the same things as you. I also flashed the PCM, left for a week battery unplugged, and cleared the code with tuner. Code always comes back. From the old O2 sensor, cut off the harness and connect to the truck's harness. Measure the DC voltage across the O2 sensor heating element leads. I believe it's the two white wires (please confirm; black and gray are for the sensor, I believe). Should read greater than 12V. When I did this, I measured 12V on the passenger and 10V on the driver. Bad news...the O2 heater is driven by the PCM, not the fuse block. I still need to test continuity to the PCM through the harness. I think it may be a bad ground reducing the voltage. If not, I will have to go to the next step and replace the PCM. All over something that does nothing other than make the government happy. Let us know what you find. [/QUOTE]
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