Failed smog because lean code P1071

Tiny
JIMMYJAMES1234
  • MEMBER
  • 2001 FORD EXPLORER
  • 2WD
  • AUTOMATIC
  • 193,823 MILES
We have had a new fuel pump, MAF sensor, o2 sensor and new exhaust gaskets on it. What else could be the problem?
Tuesday, May 24th, 2016 AT 5:39 PM

1 Reply

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,755 POSTS
Most lean mixture codes are caused by a vacuum leak on the engine. That is where I would start. If you have access to a vacuum gauge, place it on any of the intake vacuum ports and start the engine. Vacuum should be around 18 pounds at idle. Also, if you have access to a scanner that can read real time live data, it would be helpful to see what the short term trim readings are. Let me know what you find.
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Tuesday, May 24th, 2016 AT 6:32 PM

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