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1998 Mercury Mystique EMISSIONS

Tiny
DAVIED2748
  • MEMBER
  • 1998 MERCURY MYSTIQUE
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 105,617 MILES
I have a P1131 code and it states on the tester the Switch control valve sensor has detected lean condition bank 1. I have only this one code. All of the O2 sensors have been changed and the car is ruunung fine, yet this this code makes the check engine light come on. What would you say could be the problem
Davied
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Thursday, July 8th, 2010 AT 6:51 AM

1 Reply

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Lean fuel condition could be caused by one of the following below:

1. Vacuum leaks
2. EGR and PCV valve.
3. Low fuel pressure.
4. Dirty fuel injectors.
5. Mass Air Flow Sensor.
6. Oxygen sensor
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Thursday, July 8th, 2010 AT 7:03 AM

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