P0135 P1131 and no volts
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4wd High
Joined: Sep 2025
Posts: 9
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P0135 P1131 and no volts
Hi.
so I’ve replaced the o2 sensor at b1s1. Got the above codes still. I see tonight in FORScan I get no volts from this sensor. I tested the plug and find power. Where do I go next? Test the ground? If so, how?
so I’ve replaced the o2 sensor at b1s1. Got the above codes still. I see tonight in FORScan I get no volts from this sensor. I tested the plug and find power. Where do I go next? Test the ground? If so, how?
Cross-Country
Joined: Jul 2025
Posts: 51
Likes: 8
make sure there’s no sealer on threads. You will need to back probe to find the disconnect.. O2 wire being exposed under a vehicle makes them susceptible to rodents and environmental damage. We need more information on your vehicle.
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4wd High
Joined: Sep 2025
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1998 Ranger XLT 4.0 4x4 211,000 miles. Engine runs great but puffs some white smoke after start up for a short time.
Cross-Country
Joined: Jul 2025
Posts: 51
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the white wire is the O2 heater wire. The heater helps O2 to control fuel trim while engine in warming up. Without the heater the O2 would be sluggish responding to drivability situations when engine isn’t warmed up.
Cross-Country
Joined: Jul 2025
Posts: 51
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check the Ranger Station forums. There is a good chance that someone posted a schematic
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4wd High
Joined: Sep 2025
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I tested and confirmed continuity on all four wires at the pcm. I knew the 12v wire had continuity already. Since the battery was unplugged for a good 20 minutes, I’m hoping that reset the KAM. Fingers crossed I have/had an old code issue. I’ll keep this updated with what I discover.
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Cross-Country
Joined: Jul 2025
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I tested and confirmed continuity on all four wires at the pcm. I knew the 12v wire had continuity already. Since the battery was unplugged for a good 20 minutes, I’m hoping that reset the KAM. Fingers crossed I have/had an old code issue. I’ll keep this updated with what I discover.
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4wd High
Joined: Sep 2025
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There is a fuse. It looked ok but I replaced it nonetheless last night. Bank 2 is working fine and my understanding is both banks get power from the same fuse/circuit. Appreciate you sticking with me.
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4wd High
Joined: Sep 2025
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this is FORScan.
Fleet Mechanic
Joined: Jun 2023
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From: WA
This guy's videos are worth watching. As he says in the second one "new does not mean good". He has suggestions for simple sensor swaps, if the part numbers are the same.
Search "O2 sensor" on his channel and you'll find more.
Search "O2 sensor" on his channel and you'll find more.
Cross-Country
Joined: Jul 2025
Posts: 51
Likes: 8
This guy's videos are worth watching. As he says in the second one "new does not mean good". He has suggestions for simple sensor swaps, if the part numbers are the same.
Search "O2 sensor" on his channel and you'll find more.
https://youtu.be/GAQEXmIoKcQ?feature=shared
https://youtu.be/go4B7RPW8a4?feature=shared
Search "O2 sensor" on his channel and you'll find more.
https://youtu.be/GAQEXmIoKcQ?feature=shared
https://youtu.be/go4B7RPW8a4?feature=shared
Thread Starter
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4wd High
Joined: Sep 2025
Posts: 9
Likes: 0
This guy's videos are worth watching. As he says in the second one "new does not mean good". He has suggestions for simple sensor swaps, if the part numbers are the same.
Search "O2 sensor" on his channel and you'll find more.
https://youtu.be/GAQEXmIoKcQ?feature=shared
https://youtu.be/go4B7RPW8a4?feature=shared
Search "O2 sensor" on his channel and you'll find more.
https://youtu.be/GAQEXmIoKcQ?feature=shared
https://youtu.be/go4B7RPW8a4?feature=shared
excellent videos. I’m going to try replacing the sensor again after a few more tests.
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4wd High
Joined: Sep 2025
Posts: 9
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replaced the sensor and by change. Connected my test light and realized I had been mixing up bank 1 and bank 2. So hoping to start diagnosing the actual troubled sensor on Thursday.
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4wd High
Joined: Sep 2025
Posts: 9
Likes: 0
