Question about 2003 Lincoln Navigator

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2000 Lincoln Navigator - few days ago started idling very rough when truck is at a stop or in park. Service Engine Light came right around time I noticed that it was idling rough when stopped. Following codes came back P1131; P1151; P0171; P0174; What could be wrong??

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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
PCV -Leaks
Exhaust System -Leaks
O2 Sensors-worn out

Posted on Apr 06, 2011

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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

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SOURCE: 2000 Lincoln Navigator with rough idling and service engine light

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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2000 Lincoln Navigator with rough idling and service engine light


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.

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