1997 Explorer P0141 P1131
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1997 Explorer P0141 P1131
I've read many threads about the possibility of vacuum leaks, manifold leaks and wire problems associated with these codes. Explorer has 148,000 miles, automatic V8 AWD.
Being it's only one sensor tagged (Bank 1 - Sensor 2), what is the possibility that it's actually the O2 sensor?
Also, I've got the Explorer on ramps and looking on the underside it looks virtually impossible to reach the pigtail connector unless I came through the console hump from the interior. Anyone ever replace this particular sensor? Any tips?
Being it's only one sensor tagged (Bank 1 - Sensor 2), what is the possibility that it's actually the O2 sensor?
Also, I've got the Explorer on ramps and looking on the underside it looks virtually impossible to reach the pigtail connector unless I came through the console hump from the interior. Anyone ever replace this particular sensor? Any tips?
Logistics Pro
Joined: Jun 2009
Posts: 4,817
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From: Cedar Rapids, IA
Per the factory service manual, Diagnostic Trouble Code (DTC) P1131 bank 1 indicates the fuel/air ratio is correcting rich for an overly lean condition. The upstream sensor would be sensor 1, not sensor 2. It would be nice if you have access to a scan tool with datastream mode so you could monitor the sensor to see if it's railed or if it is still switching, just slowly. Since you also have the Bank 1 Sensor 2 shorted I would suggest further troubleshooting.
If you decide that you want to shotgun the O2 sensors though, it is possible to change them out. I changed out all on my former 2000 Mountaineer V8. To get to the rear harness I essentially bear hugged the transmission, one arm around it each way. Unplugging it wasn't as bad as plugging the new one in. You'll also probably want one of the sending unit low profile sockets rather than the standard O2 sensor deep socket.
-Rod
If you decide that you want to shotgun the O2 sensors though, it is possible to change them out. I changed out all on my former 2000 Mountaineer V8. To get to the rear harness I essentially bear hugged the transmission, one arm around it each way. Unplugging it wasn't as bad as plugging the new one in. You'll also probably want one of the sending unit low profile sockets rather than the standard O2 sensor deep socket.
-Rod
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Joined: Nov 2005
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yeah, change them all now, and save yourself the hassle of doing just one or two - they are cheap enough, and not too tough... I found it easier to warm up the exhaust first, or let it cool a little bit... but not until it's cold - I think I just used a box wrench on them, after I unplugged them all...
Haven't seen a code in 9 months! The other thing, is that I was getting other Cat type codes before too, and thought it was a bad cat for a long time, but turns out it was just the stupid O2's
Cheers
Haven't seen a code in 9 months! The other thing, is that I was getting other Cat type codes before too, and thought it was a bad cat for a long time, but turns out it was just the stupid O2's
Cheers
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