Todd M posted:Need some advice. Check engine light is on in the Fiat 500. I hooked up the OBD reader and even though it did not recognize it as a Fiat, I chose from the list a Mazda, and later chose a Ford Focus. It came back with a fairly generic fault for both, which was that the gas cap was not completely closed. I twisted the cap, and rechecked. The check engine light still comes on and the code still shows in the OBD reader. I disconnected the battery and reconnected it, the check engine light still comes on. The engine sounds fine. Any suggestions?
These codes are often just oxygen sensors on the exhaust. If it's the gas cap, twisting it on harder won't help because it's usually the rubber seal.