I have a '96 GC Laredo with 158k, 4.0L. The check engine light came on a couple of months ago and I did the 3 turns of the ignition switch and the codes came up as 12,21,55. So, I figure it's time to replace the O2 sensor, which I did. Now the check engine light comes on and then goes out, it's the same codes. What could be the problem..........
- posted
18 years ago