What do this mean code p 0171 fuel trim too lean

Tiny
YANWINTUN88
  • MEMBER
  • 2007 TOYOTA
  • 135,000 MILES
What do this mean code p 0171 fuel trim too lean
Friday, March 1st, 2013 AT 7:03 AM

1 Reply

Tiny
CARADIODOC
  • MECHANIC
  • 33,727 POSTS
The fuel / air mixture constantly switches between too lean and too rich a couple of times per second, then the first oxygen sensor measures the amount of unburned oxygen in the exhaust system. It sets that code if there's too much oxygen and not enough fuel. Common causes of too much air include a vacuum leak, low fuel pressure, varnish buildup in the injectors, and a dirty mass air flow sensor.
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Friday, March 1st, 2013 AT 7:30 AM

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