My 94 Ranger, 3.0 gets a check engine light often. I read the code and the ECM provides a code number of 539 which I my book says"Air conditioning on during self test". The thing is there are no performance issues with the truck and the AC works fine, just a nagging check engine light comes on after about 15 minutes of driving. Anyone seen this before or have some ideas what the problem might be? Thanks.
- posted
18 years ago