On my gf's car this code appears after about 15 miles. The car starts and runs fine. Air filter is new. The plugs are the correct shade of brown, I've checked the MAF sensor which is perfectly clean ...

As an experienced service advisor, I saw the P0420 “check engine” light code hundreds of times. This fault code indicates that your car’s catalyst system isn’t performing as efficiently as it should.

This article was supposed to be about diagnosing P0420 and P0430 issues. However, because I travel to work with shops around the country, I realize that pre-OBDII vehicles are still emissions tested ...

The world of car diagnostics has changed a lot over the last 50 years. Back in the '70s and earlier, a mechanic's most valuable diagnostic tools were usually their eyes and ears. You could figure out ...

Cars are more than just oil and steel. Modern models have incorporated electronics and computer chips to help manage and optimize their mechanical components. That means maintaining your car's ...