Cool 2004 Jeep Liberty Check Engine Light Came On 2023. Had a compression test done and at the 3rd cylinder has a compression of 65. Loose or defective gas cap if you’re lucky, a loose or defective gas cap is the culprit.
Code po171.just recently changed engine check engine light came on.needed to change spark plug coil and fuel injector. Yes, something as simple as an improperly sealed gas cap can trigger the light. The engine light illuminated and has remained lit ever since.
