About 6 months ago I was at a gas station. I could not get the gas cap off. I twisted it until it broke free. I is not a common looking cap. I bought 1 from auto zone because the mechanic stated a code for evap came up. I changed the purge valve solenoid because the engine light is still on. I bought another cap. Is there a sensor in the original cap that is causing the light to stay on? What should I do? Do you think I should replace the fuel tank Pressure switch?
Why is my engine light on? Do they still sell that gas cap? on 2002 Pontiac Aztek
by Visitor in Maywood, IL on March 27, 2010
ANSWER by Visitor on June 29, 2010
A GM dealer will have the cap. I think it was like $30. I did not pass emissions because the original had lost pressurization so had to buy the new one. There is no sensor in the cap, the system can just tell.