motoqman

steviej, BIG thanks for your helpful information and suggestion. I'll take the car to dealer then. Ittichai

It has only 33K. It is good to know that it is still under warranty. I recalled it said Bank 1 Sensor 1. Anyway, last night I looked under the hood. There is only one sensor easily accessible without any tool. So I kinda checked for any loose wire. Everything seems to be in tact. Amazingly, when I restarted car, the light disappeared :o. I have been driving it for some more that night and this morning. It seems everything is fine (no more check engine light). Is this possible that it is a false alarm - has anyone seen something like this before? Should I be concerned? Since it is still under warranty, should I bring the car to dealer and have them checked? Thanks in advance. Ittichai

Two days ago, the check engine light of my 03 ES300 has been on. Many threads on this issue in this forum suggest to go to AutoZone to get the error code. I did that this morning. The error code is p2238. I was told that the issue is with bad O2 sensor. The replacement part costs $326 :cries: Should I take to dealer or shop? Is there anything else I could do before like checking a loose wire? Thanks in advance. Ittichai