Question Answered: Check engine light on all the time
February 01, 2012, 07:13 PM
I have a '92 300 TE,w/194K miles. Just had minor repairs, plugs, fuel/air reset. Runs great, 200 miles later, the BAD BOY CEL came on. My tech said don't worry to much! Still bothered me,turns out the computers sensed a low battery! Sure as Hell, the Interstate bat had 4 dead cells. Installed new bat, CEL is out. Guess I got lucky.
I would think that your SHOP has the proper diagnostic computer to plug into the test module on the engine fire wall, driver side. With out the test computer, your bill go ballistic!