Hi -
Some quick history: I have '99 ES300 with 67,700mi. Had the engine oil sludge issue which had symptoms of CEL and Trac on lights on intermittantly and blue smoke from exhaust. This was fixed by Lexus about 4 years ago.
About 10 months ago up until recently, the CEL and Trac lights will go on for a period of time (say a few days every two months) and then will go back out. Often it seems to happen when there is a change in weather or if there is high humidity (as in raining alot!). I took it to autozone and they detected P1153 - Bank 2 fuel control shifted lean (bank2 sensor1).
My questions are this:
1. could this be related to the oil sludge issue?
2. why would the lights go on and off if the sensor was faulty. wouldnt the lights just stay on?
3. how does this affect the performance of the car besides poor fuel economy. Shifted lean means less oxygen during combustion, right?
4. is it imperative that I get it fixed or should I wait until the lights stay on always?
Thanks in advance! I appreciate it!
