Quote:
Originally Posted by Wepeel
That's all a guess. But when I put an older, more questionable O2 in my car it didn't take long at all to hit open loop. My original bad sensor took about an hour at 70+ to hit open loop - this other bad one took 10 minutes at 55-60 to hit open loop, and the brand new sensor did a 2hr+ 70 mph cruise with perfect AFR.
The other thing I noticed with the OFH is that the AFR sensor is located to pick up readings off of only one bank, and the O2 is sensing after the full merge. That may have something to do with it?
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That is definitely a reasonable hypothesis. Now the question is whether it is worth replacing the rear O2 sensor regularly or not? Or if there is an alternative sensor available that would be more resistant to fouling and/or thermal degradation. Replacing this sensor every 20k miles is certainly not ideal. Maybe as RedFRS4me said, there might be a way to modify the maps to "silence" this phenomenon; however, I am a little wary of that fix, mainly because I am not very knowledgeable about tuning.