Engine code P1131
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Engine code P1131
Hey guys i have an 02 explorer xlt 4.0L I just changed the intake gaskets and valve cover gasket yesterday on the SUV. When I got back in and started Driving I had 2 codes pop up one was P1131 and the other P0132. I don't think i missed anything with plugging wires back in, are those codes just related to the o2 sensors?
P1131 is Heated Oxygen Snesors H-2S not switching, fuel trim weak mixture
P0132 02 sensor circuit high voltage bank 1 sensor 1 which I believe is the passanger side, which would make sense since i had to remove the manifold because I couldn't get the EGR pipes to come off the exhaust manifold.
Would these indicate a bad o2 sensor? I was thinking about running some Seafoam through it to clean everything out because while i was changing gaskets i noticed alot of build up in the Intake Plenum.
Any help would be great. I have alot of other problems with the truck but those will come at a later time.
I need this fixed so i can pass emissions.
P1131 is Heated Oxygen Snesors H-2S not switching, fuel trim weak mixture
P0132 02 sensor circuit high voltage bank 1 sensor 1 which I believe is the passanger side, which would make sense since i had to remove the manifold because I couldn't get the EGR pipes to come off the exhaust manifold.
Would these indicate a bad o2 sensor? I was thinking about running some Seafoam through it to clean everything out because while i was changing gaskets i noticed alot of build up in the Intake Plenum.
Any help would be great. I have alot of other problems with the truck but those will come at a later time.
I need this fixed so i can pass emissions.
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Just ordered new o2 sensors I will update once I get them in the mail and put them on. Gonna push some seafoam through the intake and see if I knocked any crap into the intake while it was apart that might have got pushed out and now is stuck on the o2 sensor. Please continue to follow for more updates
Logistics Pro
Joined: Jun 2009
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From: Cedar Rapids, IA
Be sure to do the SeaFoam decarb before installing the new O2 sensors. You are correct, Bank 1 would be the passenger side.
Here's the description from the Ford service manual for the P1131 diagnostic code:
A HEGO 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.
The Ford manual defines the P0132 as:
The HO2S Sensor Signals are monitored for an over voltage fault. The code is set when HO2S signal voltage is 1.5 volts or greater.
Both of these codes have as possible causes - shorts in the wiring for the O2 sensors, problems with the PCM, or damaged O2 sensors. Since he issue didn't show up until after the gaskets were replaced, I wouldn't consider a bad PCM high on the list of likely issues. But I would suggest you double-check the wiring to make sure you don't have a short before installing the new O2 sensors. It might be interesting to clear the codes and then unplug the passenger side sensors to see if these codes go away or come right back. If these particular codes come back that could point a bit more strongly toward damaged wiring.
-Rod
Here's the description from the Ford service manual for the P1131 diagnostic code:
A HEGO 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.
The Ford manual defines the P0132 as:
The HO2S Sensor Signals are monitored for an over voltage fault. The code is set when HO2S signal voltage is 1.5 volts or greater.
Both of these codes have as possible causes - shorts in the wiring for the O2 sensors, problems with the PCM, or damaged O2 sensors. Since he issue didn't show up until after the gaskets were replaced, I wouldn't consider a bad PCM high on the list of likely issues. But I would suggest you double-check the wiring to make sure you don't have a short before installing the new O2 sensors. It might be interesting to clear the codes and then unplug the passenger side sensors to see if these codes go away or come right back. If these particular codes come back that could point a bit more strongly toward damaged wiring.
-Rod
Logistics Pro
Joined: Jun 2009
Posts: 4,818
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From: Cedar Rapids, IA
^ What he said. The heater is to keep the sensor up to operational temperature to minimize what used to be called "open loop" operation in the earlier computer controlled cars with exhaust emissions control.
There will be at least three, and probably four HEGO sensors on your F150. There will be one before each catalytic converter and either one after each converter, or one after both converters.
-Rod
There will be at least three, and probably four HEGO sensors on your F150. There will be one before each catalytic converter and either one after each converter, or one after both converters.
-Rod
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