We check a lot of check engine lights here at AutoZone. Learn 5 common causes of a lit light, and what you can do to take care of it.

Wondering how to clear your Check Engine light? Learn how to safely reset it using a scanner, battery disconnect, or drive cycle. Keep your car running smoothly with this step-by-step guide.

Every driver dreads seeing a warning sign light up on their dashboard, and few are more concerning than the Check Engine light. But when that symbol starts to flash, it’s not a time to panic, but it is …

Get a free check engine light diagnosis with Fix Finder. Find out what's wrong and how to fix it fast at AutoZone.

Check engine light on? You can use AutoZone's Free Fix Finder Service to get a free code reading and vehicle health report.

If your Check Engine Light is on, use a code reader to see what diagnostic trouble codes the system puts your way. If you don’t have a code reader, stop by AutoZone to use our free Fix Finder program.

BMW Check Engine Light on? Learn common causes like loose gas caps or misfires and how to fix them quickly.

It contains hydrocarbons that can contaminate both air and water. If you suspect you have a faulty fuel cap, we can check the DTCs for you and help narrow down the cause. And when you need a new …

A blinking Check Engine light means there’s something seriously wrong with the emissions system. The shaking suggests you’re having a misfire, which is dumping unburnt fuel into the exhaust, while …

When your downstream O2 sensor detects that the converter is not operating up to proper spec – it sends a warning. This warning comes in an engine trouble code – PO420 or PO421. Depending on …