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238,000 miles. Several factors might have been at work here. on Saturday, I spent 20 minutes or so idling the engine trying to figure why my OBD-II scanner wouldn't work (another story). Once I got the scanner working, all the 02 sensors were "flat lined". even with reving the engine a bit. so I took it for a spin around the neighborhood - they came to life and started cycling (went closed loop) after going a couple of blocks. But fell flat again while at stop sign at idle (open loop).
I am not throwing codes, so I probably will ignore it. However, it's still bugging me.... I'm wondering if my 02's are lazy or if my CATs are weak? (all original) Thoughts? (RockAuto showing Denso OEM 02's are a "favorite" item - hmmm, their price isn't bad either).....
 
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