Sensors Archives

Why is My Check Engine Light On?

Learn 5 common causes of a lit check engine light, and what you can do to take care of it.

Bad Oxygen Sensor (O2) Symptoms & Replacement Cost

O2 sensors monitor your engine's air-fuel mixture, so a bad one means trouble down the road. Learn the signs to watch out for.

AutoZone employee using fix finder to diagnose check engine light

How to read your check engine light with Fix Finder

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

Throttle position sensor (TPS) over a white background

Symptoms of a Bad Throttle Position Sensor

The throttle body system helps your engine accelerate smoothly. Learn the symptoms of a bad throttle position sensor and how to replace it.

Close up of fuel gauge with its brake light on

Brake Light On? Find Out Why

Learn what the most common issues are that cause a lit brake light.

How To Tell If Your Mass Air Flow Sensor Is Bad

A faulty MAF sensor can cause your vehicle to run too rich or run too lean. You'll notice if the tailpipes eject black smoke or when the engine seizes.

Person lifting a mass air flow sensor to show how to clean MAF.

How to Clean a Mass Air Flow Sensor

Cleaning the MAF as part of regular routine maintenance can help reduce and/or prevent problems.