Three of the main reasons the check engine light or malfunction indicator lamp (MIL) turns on are: a loose fuel cap, issues with the ignition system, and problems with the emissions system. Many ...

Question:I have a 2001 Nissan Pathfinder with the 3.5-liter V-6. The check-engine light came on, and I had code P0420. I was told it was a bad catalytic converter, so I went ahead and replaced it ...

A check engine light that returns after being reset means the underlying fault has not been repaired, only cleared from ...

OBD Auto Doctor app reads car diagnostic codes for $15 total cost versus $150+ dealer visits, turning check engine light panic into manageable information.