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 ...

Smarter fault detection: AI-assisted scanners and apps now analyze sensor data, run tests, and suggest targeted repairs instead of just listing codes. DIY tools expand: Bluetooth OBD2 adapters and ...

When the check engine light comes on in a vehicle, it’s indicating that there is some issue with the car that should be checked out. It could be something minor, such as the gas cap not being screwed ...

The check engine light has always been a bit of a gamble. Sometimes it’s a loose gas cap. Other times, it’s a four-figure ...

Monsour Law Firm Most drivers are familiar with the "Check Engine" light, but few things are more commonly ignored than the diagnostic code for ...

The average age of all vehicles on the road is rising, as are their ensuing repair costs. Today’s cars, trucks and SUVs are ...

When your vehicle's check engine light (CEL) comes on, it's often a sign that something needs attention. But with over 20,000 parts working together in your car — many important for normal operation — ...

There are few things more distracting when driving than a check engine light, or CEL. The CEL is a vague, catch-all light that indicates there is an error somewhere ...

For most drivers, an oil change is a quick, hassle-free service that typically puts you out no longer than an hour and costs you (give or take) a hundred bucks. But even if you're perfectly on top of ...

April is Car Care Awareness Month — and also National Canine Fitness Month, International Guitar Month and National Soft Pretzel Month, among many others — and the folks at CarMD are back with their ...

The average cost to fix a "check engine" light is at a record high according to a newly released study from CarsMD. Its 2026 CarMD Vehicle Health Index report reveals that the average cost to ...

Forbes contributors publish independent expert analyses and insights. Jim Gorzelany is a veteran automotive journalist. This article is more than 4 years old. According to CarMD.com, the national ...