1999 Ford Explorer

Tiny
MEVANSH08
  • MEMBER
  • 1999 FORD EXPLORER
1999 Ford Explorer 6 cyl Four Wheel Drive Automatic

my engine is too lean. Help me fix it
Wednesday, December 31st, 2008 AT 7:33 PM

1 Reply

Tiny
DAVE H
  • MECHANIC
  • 13,384 POSTS
41) DTC P0171, P0172, P0174 Or P0175

DTCs P0171 and P0174 indicate air/fuel ratio is correcting rich for an overly lean condition. DTCs P0172 and P0175 indicate air/fuel ratio is correcting lean for an overly rich condition. Possible causes are:
Fuel system malfunction.
EGR system malfunction.
Air intake or vacuum system leak.
Engine oil level too high.
Incorrect cam timing.
Restricted air cleaner.
Faulty PCV system.
Excessive internal engine wear.
Inspect engine for obvious defects in specified systems. Repair as necessary. If no faults are found, go to next step.
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Thursday, January 1st, 2009 AT 6:14 AM

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