code p1131

[manger]

here's what I got so far from a 2000 Ford Mustang Workshop Manual:

code 1131 see possible causes for code 1130

Possible causes:

Elecrical
1. short to VPWR in harness or HO2S.
2. water in harness connector.
3. open shorted HO2S circuit
4. corrosion or poor mating terminals and wiring
5. damaged HO2S
6. damaged PCM

Fuel System
1. excessive fuel pressure
2. leaking contaminated fuel injectors
3. leaking fuel pressure regulator
4. low fuel pressure or running out of fuel
5. vapor recovery system

Induction System
1. Air leaks after MAF
2. Vacuum leaks
3. PCV system
4. improperly seated engine oil dip stick

EGR System
1. Leaking gasket
2. stuck EGR Valve
3. Leaking diaphram or EVR

Base Engine
1. oil overfilled
2. cam timing
3. cylinder compression
4. exaust leaks before or near the HO2S.


I'll be back with my progress! God Bless Your RBV!

 

[manger]

I pulled my o2 sensors. I found a heater wire was shorting on the drive shaft. I also found that they are ford o2 sensors, probably have 200,000 miles on them. I connected my voltmeter to the signal wire and got a bunch of readings with a propane torch. They don't seem to be in very good working order when heated. Anyone familar with Ford o2 sensors? is the black wire the signal wire? there are four wires, two white=heater, one gray=ground, one black=signal. correct?
can I use any o2 sensor as long as its four wire and the correct thread? I'm considering the jy for replacement o2's.