Here are 2025's most popular questions and answers from The Journal's Car Doctor column, from rotating tires to oil changes.

The overall average repair cost for a Check Engine light issue was $393, an increase of 3.6% from 2020 and 2016 model year cars had the highest average at $397.87. The light is set off by a variety of ...

When the check-engine light snaps on, it is not a suggestion, it is your car’s way of saying something in the powertrain or ...

The costs of buying a new or used car have climbed in recent years, and so has the average repair bill. If a vehicle purchase or major repair isn’t in the cards (or budget), maintaining the health 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 ...

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 ...

You're driving along in peace when suddenly the dashboard lights up with a flashing Check Engine light. Can you ignore it and drive as usual until the next oil change ...

In order for our cars to carry us to and from our various destinations reliably, all the parts must work together smoothly. The fuel and air intake systems provide the ingredients necessary to power ...

When your vehicle's check engine light (CEL) comes on, it's often a sign that something needs attention. But with over 20,000 ...

Today’s cars and trucks are literally rolling test beds of technology, which has tended to make the days of the so-called shade tree mechanic and eyeball diagnoses of what ails a given model a distant ...

All vehicles built since 1996 are equipped with what’s called an OBD II (onboard diagnostics) system that taps into a car’s electronic control unit on a real-time basis and illuminates either of ...