Possible causes for codes p0131 and p0151
02-04-2006, 11:06 AM
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Last edited by Mort; 02-04-2006 at 11:15 AM.
02-05-2006, 01:10 PM
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A friend is supposed to come over tonight with a laptop so I can do some logging. What are the different parameters I should look for besides the fuel trims and the injector duty cycle? I guess I should be looking at the front o2s also? Anything else? I hope to do this tonight so if you know of anything I should be looking for please tell me. I am anxious to get this thing fixed. It has been quite awhile since I could drive it anywhere. Thanks again.
02-05-2006, 07:25 PM
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In what little time I had this is the only run I was able to log. If I have to I can get more. I dont have autotap on my computer so I dont think I can post it. Can anyone post it for me? Basically when I jump on the throttle the o2 rich to lean percentage would go to zero. And at the same time my short term fuel trims would go to zero also. Then when I let off the gas my timing would go near zero and even in the negative. Sometimes the o2 and fuel trims would jump back up, but sometimes they would stay off for a while. WTF is up with that? So what do you guys think? More logging? Check the tune? Check the installation? Kick the supercharger off a cliff? JK. Seriously, what would you do in this situation?
02-08-2006, 11:30 AM
#15
1)Inspect the HO2S wire. The sensor pigtail may be in contact with the exhaust manifold or the exhaust system.
2)Inspect the HO2S oxygen supply. An oxygen supply inside the HO2S is necessary for proper operation. The HO2S wires provide the supply of oxygen. Inspect the HO2S wires and the connections for breaks and for contamination.
3)Inspect for an intermittent ground in the signal wire between the connector and the sensor.
4)Inspect for contaminated fuel. Water near the in-tank fuel pump inlet can be delivered to the injectors. The water causes a lean exhaust and can set a DTC.
5)Inspect the fuel pressure. The system will be lean if the fuel pressure is low.
6)Inspect for exhaust leaks. An exhaust leak near the HO2S can cause a lean condition.
7)Inspect for vacuum leaks or for crankcase leaks that can cause a lean condition.
8) A sensor pigtail may be mispositioned and contacting the exhaust system.
9) An intermittent short to ground in the signal circuit between the PCM connector and HO2S
10) A poor PCM to the engine block ground
11) Any lean injectors. Perform the Fuel Injector Balance Test.
A poor connection
Rubbed through wire insulation
A broken wire inside the insulation
If the above components are OK, the HO2S may be at fault.
2)Inspect the HO2S oxygen supply. An oxygen supply inside the HO2S is necessary for proper operation. The HO2S wires provide the supply of oxygen. Inspect the HO2S wires and the connections for breaks and for contamination.
3)Inspect for an intermittent ground in the signal wire between the connector and the sensor.
4)Inspect for contaminated fuel. Water near the in-tank fuel pump inlet can be delivered to the injectors. The water causes a lean exhaust and can set a DTC.
5)Inspect the fuel pressure. The system will be lean if the fuel pressure is low.
6)Inspect for exhaust leaks. An exhaust leak near the HO2S can cause a lean condition.
7)Inspect for vacuum leaks or for crankcase leaks that can cause a lean condition.
8) A sensor pigtail may be mispositioned and contacting the exhaust system.
9) An intermittent short to ground in the signal circuit between the PCM connector and HO2S
10) A poor PCM to the engine block ground
11) Any lean injectors. Perform the Fuel Injector Balance Test.
A poor connection
Rubbed through wire insulation
A broken wire inside the insulation
If the above components are OK, the HO2S may be at fault.
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