I just bought my truck and on the way home, the "service engine soon" light came on. Checked it the next day and it was code 0420 (either the cat or the o2 sensor I believe. Anyway, took it back to the dealership, they cleared it, and it's been two days since and it hasn't come back on. They have done a few other shady little things and I wouldn't put it past them to somehow disable the light to keep it from coming back on. Where do I look and what do I look for to determine if they did indeed disable the light? Thank you in advance for your help.
have the same problem?
Wednesday, December 7th, 2011 AT 5:16 PM