Your vehicle has a problem if the check engine light (CEL) glows. Diagnostic trouble codes (DTCs) stored in the computer help find the cause.

Hello. I've had an ongoing problem with my 2008 Corvette for over a year. I have reoccurring fault codes of P0171 and P0174, fuel trim lean on bank one and two. I have had the car to four shops and ...

Why Replace A Faulty Oxygen Sensor? A faulty sensor cannot transmit accurate data to the car's computer, causing the engine to run unbalanced. An unbalanced engine either burns fuel with too much or ...

Unscrewing a sensor and replacing it is pretty straightforward. You might need this special socket to clear the wires. Twelve years and more than 100,000 miles have passed under your trusty commuter ...

I had a test done at local auto-parts store that showed a code of PO138. They told me this indicates a problem with the oxygen sensor. I replaced the oxygen sensor and the light never went out. I ...

How do I tell if a catalytic converter is plugged up? I have noticed a funny rapid noise that is hard to describe. It sort of sounds like a ticking / chugging noise, but only when a load is applied. I ...

QUESTION: I own a 1997 Dodge Caravan 3.3 liter V/6. The check-engine light came on and the code was P0401 low EGR flow. The mechanic replaced all the parts in the EGR system and said the system is ...