GM Ecotec P0171 Lean Code & Bad Gas Mileage
July 22, 2012 Lean Codes No Comments
© DenLorsTools.com Summary: P0171 is a lean code which can indicate a vacuum leak especially if we are talking about a Ford. However, GM cars including Chevrolet, Pontiac, Oldsmobile, Saturn and others are not prone to having vacuum leaks. Questions regarding a lean code and poor gas mileage on a Pontiac Sunfire ( which is similar to a Chevrolet Cavalier) prompted this repair article. In this repair article we give advice on what to look for and how to properly check MPG (Miles Per Gallon).