Question about 2003 Ford Taurus

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2003 ford taurus what to do to fix,have codes 1131 and 1151.

Engine light is on and heasitates,r.p.m.s go up and down when in drive at stop light.

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Error codes 1131 and 1151 say : Lack of Upstream Heated Oxygen Sensor Switch Sensor Indicates Lean - Bank No. 1 (1131) and 2 (1151).

a lot of causes are possible:

* Short to VPWR in the harness or HO2S
* Water in the harness connector
* Open/shorted HO2S circuit
* Corrosion or poor mating terminals and wiring
* Damaged HO2S
* Damaged PCM
* 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
* Vacuum Leaks
* Improperly seated engine oil dipstick
* Leaking gasket
* Stuck EGR valve
* Leaking diaphragm or EVR
* Oil overfill
* Cam Timing
* Cylinder compression
* Exhaust leaks before or near the HO2S(s)

the idle up and down is because the electronics ist stuck in a try to compensate, overcompensate, reset cycle

Posted on May 29, 2009

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Posted on Jan 02, 2017

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