how do I correct too lean air/fuel mix?

Asked by Jun 15, 2017 at 02:08 PM about the Pontiac Vibe

Question type: Maintenance & Repair

how do I correct too lean air/fuel mix on a 2005 Vibe? PO171 " mass airflow
sensor bank 1 1 too lean".

2 Answers

9,890

If your MAF sensor is sending bad info or the O2 sensor (cars with 2 sensors) is not working correctly it will screw the mixture up in fact when an O2 fails it reverts the engine to Rich

895

Most likely cause is a vacuum leak. But you could always try cleaning the Mass airflow sensor. With an over the counter MAF cleaner spray.

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