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Message: <blockquote data-quote="OptimistPrime" data-source="post: 364240" data-attributes="member: 44207">Thanks. Going down the list, it seems I must have a fault in the wiring between the ECM and the TPS. That's the prognosis for both code 21 and 22. For 31, it says my Park Neutral Position switch has a fault. I wonder if this might relate to a condition the car had last year, where it would get stuck in park. I would have to turn the car off and back on to make it work right, iirc. Thankfully it stopped doing that after a while.The code 58 seems to indicate something is wrong with my immobilizer control module. I take it this is the security system, and won't affect drivability. Probably not a priority to fix that. NO ONE is going to steal this car, trust me. I wonder if that TPS wire fault might be near the pigtail. I had an O2 sensor pigtail go bad in my truck, and it looked fine externally. However on the inside the wire was all corroded and green. I think my next steps will be to troubleshoot that wiring and perhaps put a new pigtail on it, if no damage is visible elsewhere. This is almost certainly a TPS problem, considering the trouble the car has with accelerating.</blockquote>