The sign pops up during summer time (about this time) and goes away after a day or two. This has been happening for the last two years. Each summer it happened about two times. There was a recall of ECM module two years ago which was replaced by the dealer then. Can you help me narrow down the exact probable cause?
Toyota Q&AAsk Your Question
2007 Toyota Corolla Question: Check Engine Sign - Code P0138 - pops up summer time and goes away
o2 sensor bank 1 sensor 2 has high voltage, poss sensor issue
Replyrafieagle, August 06, 2012, 12:46Rookie
When checking the code P0138, I found 4 or 5 probable causes and O2 sensor was one of them. How positive are you with this selection? I appreciate your answer. If I know for sure O2 sensor is the reason, it can certainly minimize my additional costs . Thanks
Replyglobalhelper, August 06, 2012, 18:43Master
it can be sensor or circuit the cofe only lets u know what circuit is failing not what part to change. you need to read with a scanner or test manually.
Replyrafieagle, August 07, 2012, 06:18Rookie
How do I do this? Can you elaborate on this? All I know that code P0138 was displayed when checked with a scanner at Autozone. A little more in depth explanation will help me a lot. Thanks for your time.
Replyglobalhelper, August 07, 2012, 09:45Master
you need to seek help on this matter