Cadillac Repair: 1991 sedan deville 4.9L, fuel mileage, mileage

Question
codes E26 and E55

car gets 12 mpg in city-is that correct
please advise

Answer
If your using the digital fuel mileage display panel this is just an average mpg and is not very accurate. Check your fuel mileage as you did in the old days.

The FIRST thing you want to do is CLEAR (erase) these codes from the computer via:

1. Re-enter diagnostics and when you see the .7.0, Simultaneously push and hold the OFF and HI buttons until E.0.0 appears and then press AUTO.

2. Turn OFF the ignition key, drive the car and see if the check engine light comes back on with any or the same codes and let me know.