Question about 2003 Lincoln Navigator
P1131 Lack of HO2S-11 Switch ,Sensor Lean
P1151-Lack of HO2S-21 Switch ,Sensor Lean
PO171- System to Lean (Bank 1)
PO174-Systen to Lean (Bank 2)
Fuel Filter -Plugged
Low Fuel Pressure
Evap System -Leaks
Leaks - in ducting,air filter to throttle
Exhaust System -Leaks
O2 Sensors-worn out
Posted on Apr 06, 2011
The codes shown above are correct, well mostly. u can cross test with the manual
Posted on Apr 09, 2011
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Posted on Jan 02, 2017
i had the same trouble, there is a rubber boot under the cover on the top of the motor, it is coming from the egr valve, takes about 5 mins to repair and less than 5 dollars.
Posted on Jul 25, 2009
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