Help on code P1131 - F150online Forums


Help on code P1131


Old 03-04-2005, 07:01 PM
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Help on code P1131

I know code P1131 says its the O2 Sensor saying it is lean but what causes this and whats the resolution???????? a new O2 sensor?
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Old 03-04-2005, 10:23 PM
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It could be. The code is only implicating bank 1, so the engine, as a whole, is not running lean or the other bank would have a code set for the same.
The heating element in the sensor may have gone open or the connector/wire harness has an open.
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Old 03-05-2005, 07:56 AM
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If the heater element opens, a different code will be set.

Most likely the O2 sensor is weak and slow. It's the upstream one on the passenger side.

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Old 03-05-2005, 11:50 AM
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Different Code

Ok I'll change the O2 sensor and see what that does.... On my dads' truck, he has a 4.6 97 f-150. The code P0401 pops up. (Exhaust gas recirculation flow insufficient detected) Whats the cause and resolution to this?
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Old 03-05-2005, 05:49 PM
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which is bank 1 sensor 1

some people say passenger side, some say driver side????? which one is bank 1 sensor 1
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Old 03-05-2005, 05:53 PM
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Bank one is the bank with number one cylinder. Pass side, first o2 sensor behind the exhaust manifold. The dad's code, replace the dpfe sensor, 99.9% of the time, the sensor has gone out of range and that is it.

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Old 03-07-2005, 12:46 AM
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another problem

thanks for the help everyone..... i now have anoter problem.... when i get around 4000 rpm's, my battery ligh flashes on and off. am i correct that this is the alternator? also, when i bought the truck a month ago, the guy replaced the alternator with a used one out of the junk yard. after he changed it, thats when my temperature gauge started pegging out on hot about a minute after the truck is started.......any way a bad alternator could caude the gauge to mess up??
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Old 04-27-2005, 03:16 PM
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I had the same problem with my altenator the light would come on at high rpm then it eventualy stayed on and the altenator took a crap so I would get a new one and try that I will almost bet thats the problem and if the alt isnt working properly it will make the gauges act funny and give improper readings. good luck
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Old 04-28-2005, 04:37 PM
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Hey cdp25 I have a computer scanner and i looked in my book and it say the code means Lack of HO2S11 Switches-Sensor Indicates Lean thans that it says in my book. Hope it helps
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