After Engine Swap Downstream O2 Sensor Question

[tmontague]

Iirc that was the code I had after I did the swap and failed to plug the ecu holes from pulling the 3 immobilizer pins. Drove across the border in a freak snowstorm with wet conditions and a ton of salt. The code got thrown on my way home. Plugged the holes and it never came back.

Jus t something to keep in mind if your o2 sensor checks out. Could be a faulty ecu or simply a short caused by some water

[06YarisRS]

Originally Posted by tmontague

Iirc that was the code I had after I did the swap and failed to plug the ecu holes from pulling the 3 immobilizer pins. Drove across the border in a freak snowstorm with wet conditions and a ton of salt. The code got thrown on my way home. Plugged the holes and it never came back.

Jus t something to keep in mind if your o2 sensor checks out. Could be a faulty ecu or simply a short caused by some water

Yeah, I read that in one of your posts. I'm optimistic that it's just the o2 sensor. If it did turn out to be the ECU, there's plenty of those available on eBay and they're pretty cheap. I did lose one of the tiny plugs when I swapped the pins and I put a dab of rtv in the hole sealing it off. I can't see how any moisture has gotten in as the car has been bone dry in the garage. I won't rule anything out though. It may be a bad ECU, but I ran the car many times and drove it before the code appeared.