We recently purchases a 2007 Buick Lucerne. After getting gas, the message for fixing the gas cap came on. My husband tightened the gas cap and then the check engine light came on and has stayed on for the last 2 weeks. We took the car back to the dealer and they said they found nothing wrong and yet the check engine light stays on. We got the service record from the previous owner and they had taken the car back to the dealer about 4 or 5 times just before they traded the car in. What is causing the check engine light to come on? We are taking the car back to the dealer this week. At what point do we determine that we have a lemon? We really do like the car, but not if we have to pay for repairs that appear to go back to before we owned it.
Check engine light stays on. on 2007 Buick Lucerne
by candmgoss in Bolivar, MO on February 28, 2011
ANSWER by sparky8265 on February 28, 2011
random thought i had a similar issue with a gas cap try a new one from a parts store for your car, the light comes on for a leak from the evap system and once I changed it everything worked fine
An intake manifold vacuum leak can develop from a variety of sources, often causing illumination of the Check Engine Light with codes P0171 & P0174 stored. Thorough diagnoses will be necessary...
A Loose or worn gas cap may cause Check Engine Light to illuminate.