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  #1  
Old 05-24-2012, 09:56 PM
Birchhatchery Birchhatchery is offline
Ford Motor Company
 
Join Date: Mar 2011
Posts: 132
Default error code p1131?

i got error code p1131 lack of HO2s11 switch sens indicates lean? i have done no motor work or anythang it just came on out of the blue what does it it mean i have a 96 ford ranger single cab 2wd 4 cylinder motor automatic 125 thousand miles on it what does it mean what happens if i let it be?
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  #2  
Old 05-25-2012, 07:41 PM
Lalogga Lalogga is offline
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Join Date: Jan 2012
Posts: 178
Default Re: error code p1131?

Reset the CEL and see if it comes back. How does it run? When was the last time it had a tune up? Plugs...wires...air filter...ect.

P1131 Lack of bank 1 02 Transitions - lean
Explanation detected bank 1 02 at its lean limit
Probable cause misfire on bank 1.
vacuum affecting bank 1 only.
fuel injector problem bank 1.
engine mechanical condition.
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Last edited by Lalogga; 05-25-2012 at 07:46 PM.
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  #3  
Old 05-25-2012, 09:24 PM
Birchhatchery Birchhatchery is offline
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Join Date: Mar 2011
Posts: 132
Default Re: error code p1131?

ya it came back on i dont no about plugs and wires but the air filter fine it runs just fine like it did before i was told it was the upstream oxygen sensor
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  #4  
Old 05-26-2012, 04:43 AM
modelageek modelageek is offline
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Join Date: Jan 2009
Posts: 6,268
Default Re: error code p1131?

Quote:
Originally Posted by Birchhatchery View Post
i got error code p1131 lack of HO2s11 switch sens indicates lean? i have done no motor work or anythang it just came on out of the blue what does it it mean i have a 96 ford ranger single cab 2wd 4 cylinder motor automatic 125 thousand miles on it what does it mean what happens if i let it be?
if you go that code by itself then most likely it is the precat o2 sensor....replace it...
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2004 Ext Cab, 4WD, 4.0, Auto, 154k. (4.0 engine is out of a 2009 Ranger w/96k) ( as of 7/1/2017)

2004 Ranger, Ext Cab, 2WD, 3.0, 5 speed , 4WABS, crank windows, no cruise, Edge 116k.(6/5,2014) (SOLD).
1999 Ford Ranger, Reg Cab, 2.5, 5 speed, 2WD, no AC, 150k (SOLD).
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