I just change the head gasket of my Disco 1 includuing a head job. I took it to a local shop and happy with the price and service but the CEL came on. I did found the reset under the passenger seat and did the reset but CEL still on. I went to Autozone, Pep Boys and Kragen but they do not have an OBD 1 for the 1994 Disco. My Disco have 171 K and is running fine without any misfire. I just need to read the code to check if problem was the O2 sensor since I haven't change them yet. Any input on getting rid of the CEL is highly appreciated.