Oops! I had similar experience.

来源: 于 2009-02-06 13:28:53 [旧帖] [给我悄悄话] 本文已被阅读：次

My car passed the smogcheck when its check engine light was on in 2006. But there was a mark on my certificate, something like "check eng light on".

A lot of factors can cause the check engine light on. It doesn't have to be related to the emission system. My car had a bad cooling senser at that time. Hope this can help.