Mill code 96 LHS

My 96 LHS check engine light came on yesterday. I checked the code with the key on off, on off, on and got a code 52.
Does anyone know what this is about ?
Thank you in advance Ivan.

Code 52: Oxygen Sensor signal input indicates rich air/fuel ratio condition during normal operation.

Could be anything from a bad O2 Sensor (one of 4 on the car) or even possibly a stuck fuel injector. A dealer with a scan tool can tell you more about what is going on.

Thank for the reply AWP9521.
Went to town with the car last night and the engine light went out, don't know what to think now. But will keep your advice in mind if it occures again.
Ivan