05-07-2010, 04:07 PM
Join Date: Sep 2009
Location: Middle River, MD
This is from obd-codes.com
What does that mean?: A Heated Exhaust Oxygen (HO2S) sensor indicating lean at the end of a test is trying to correct for an over-rich condition. The test fails when the fuel control system no longer detects switching for a calibrated amount of time.
Symptoms: You will likely not notice any drivability problems.
Causes: A code P1151 may mean that one or more of the following has happened:
Short to VPWR in the harness or HO2S
Water in the harness connector
Open/shorted HO2S circuit
Corrosion or poor mating terminals and wiring
Excessive fuel pressure
Leaking/contaminated fuel injectors
Leaking fuel pressure regulator
Low fuel pressure or running out of fuel
Vapor recovery system
Air leaks after the MAF
Improperly seated engine oil dipstick
Stuck EGR valve
Leaking diaphragm or EVR
Exhaust leaks before or near the HO2S(s)
1998 XLT 4x4 5.4, Rancho 4" lift w/RS9000 shocks, 3" Body Lift, 35" BFG AT KO on Weld Wheels, Tactical Armor Group Bumper, Tuff Stuff 12,500 lb winch, Rancho Skid Plate, Flares, Magnaflow SS Dual exhaust, Dual Optima Red Tops, Pioneer Touch Screen Nav Unit, Pioneer DVD w/ 7" Drop Down, Backup Camera w/ 10" Monitor SOLD 5/20/12
Replaced with a V10 Excursion Limited
Last edited by tonydiv; 05-07-2010 at 04:10 PM.