I had a problem with my 95, 323. The Check Light was on the dash, so I had a look around the web for on
how to read the codes.
Came across this site www.auto-diagnostic-codes.com
Has FREE code info on Engines, ABS, Auto Trans, Airbags.... for cars from US, European, Australian
and Japanese and Korean vehicles.
I was able to follow the instructions to read my engine codes, and then type the code in the
Code came up as Code 32: HO2S Heater Control Circuit High (Bank 1, Sensor 1)
I tested and replaced the sensor, and that fixed problem. Just thought this website might also help others.