Check Engine Light

It is trouble, means a code has been set & needs to be read. It can be reset with the code reader. The dealer can read & diagnose it, or some here have mentioned getting theirs read at AutoZone.

Blair

Allen, It probably needs new O2 sensor/s. Take it to a Checker Auto or similar and they will read the codes for free. Sparky

Autozone doesn't read the codes here anymore. They say it's got something to do with liability but the manager of the Autozone store I went to read my code for me anyway. It turned out to be an O2 sensor and the dealer fixed it for free

Even though the warranty on my 2002 F-150 truck has expired (40,000 miles), the warranty on the emissions has not.

Bought a reader (160$) came up P0133 (Sensor CKT slow response) Bank 1 Sensor 1

O2 sensor was good guess

I reset the code without repair How critical is that repair.. Should I make a pitstop or wait?