kosmo69

could a faulty 02 sensor contribute to a rough idle and even cause the engine to stall? This just started happening, even tho the CEL has been on for several months. tks

lexus114

Yeah thats possible,it depends on what is triggering the light to come on. Get the code checked and post on here so we can point you in the right direction.

thomas1

Give us a code, but your problem sounds like the IACV valve see this post from other site. A good cleaning fixes it most of the time.
http://us.lexusownersclub.com/forums...c=7408&hl=iacv
https://www.clublexus.com/forums/rx-...-write-up.html

salimshah

I would get the read and if there are more than one error code, then clear it. On first re-occurrence of CEL get another read. Dont loose the first read in case things go worse. The reason I suggest the second read is that the system may already be in a corner based on the basic problem and you may have secondary issues being reported in the first read.

I hope this makes sense.

Salim

ps: Usually CEL is not catastrophic, but ignoring it is not right. Example, you may loose you cat and the repair cost can snowball. Vehicle is telling you something, do not ignore ... at least get is read and then determine what the risks are.

kosmo69

darn! my code reader is not working! anyhow I cant recall the actually code it was one of the pre cat 02 sensors, (Mill bank something?). I will clean the IACV valve check back. thanks

kosmo69

I've miss diagnosed the problem. thanks

Lexmex

The code readers can sometimes go haywire. I had an issue with my Actron recently, but it turned out it was a bit dirty on the connection. However, I know others that have had issues as the vehicle has gotten older (or the battery) and have switched to a an OBD2 scanner that has a battery. I plan to get one of those shortly to be able to read other information out of the vehicle.

kosmo69

I've missdiagnosed the issue. It only occurs when the AC is ON. I've posted a new thread. thanks
BTW I did clean the IACV valve but that didnt resolve it.

salimshah

CEL is on or off now?

Salim