Question about 2000 Ford Contour

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Engine rough idle. code p1131. replaced o2 sensor.

Engine rough idle

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Vacuum leak in PVC line or clogged PVC. its a leak after the map sensor. o2 sensor is correcting for a lean condition so its adding fuel to your car when the o2 sensor detects the extra air.

Posted on May 24, 2010

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Posted on Jan 02, 2017

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My 97 Thunderbird is rough idling. I cleaned the bank 1 02 sensor and it still has a rough idle. I can floor it and the idle goes away.


You don't clean O2 sensors , if bad you replace them . An only if there is a DTC - diagnostic trouble code or you check out O2 sensor performance with testing , using scan tool , lab scope or multimeter . A rough idle is usaully caused by a vacuum leak , a engine misfire , IAC - idle air control air passages clogged . There are videos on youtube on how to test to find rough running problems .

Nov 06, 2016 | Ford Thunderbird Cars & Trucks

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Changed o2 sensor and trouble code p1131 keep coming up


What make vehicle do you have ? This code doesn't necessarily mean the sensor is bad ! That is why these thing's need to be tested before replacing , check with a scan tool that shows engine data . This code indicates a lean condition ( vacuum leak ) or a ( fuel problem ) P1131 Lack Of HO2S Switch Sensor Indicates Lean Fixed Lean O2 Is the sensor lying

Jun 07, 2015 | Cars & Trucks

1 Answer

2000 ford e350 CNG van p1131


Check the help link provided below:----

Ford runs lean and idles rough?
http://technoanswers.blogspot.in/2012/02/ford-runs-lean-and-idles-rough.html

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Thanks.

Nov 26, 2012 | 2001 Ford Econoline

2 Answers

2000 Lincoln Navigator - few days ago started idling very rough when truck is at a stop or in park. Service Engine Light came right around time I noticed that it was idling rough when stopped. Following...


P1131 Lack of HO2S-11 Switch ,Sensor Lean
P1151-Lack of HO2S-21 Switch ,Sensor Lean
PO171- System to Lean (Bank 1)
PO174-Systen to Lean (Bank 2)

Fuel Filter -Plugged
Low Fuel Pressure
Evap System -Leaks
Leaks - in ducting,air filter to throttle
PCV -Leaks
Exhaust System -Leaks
O2 Sensors-worn out

Apr 06, 2011 | 2003 Lincoln Navigator

1 Answer

I have a F-150 99 with a code of P1131... Is it that sensor off the exhaust manifold the problem?? I also heard you have to have a special tool for this?? It runs great maybe idles a little rough. Does...


The P1131 means that your upstream oxygen sensor (the one closest to the engine) is not switching rich to lean and back as frequently as it should. This could be due to a vacuum leak, a failing oxygen sensor, or a rich fuel mixture.
Rich mixture - Too much fuel, not enough air.
Lean mixture - Too much air not enough fuel.

Jun 29, 2017 | 1999 Ford F150 Regular Cab

2 Answers

P0136, P1131, and P1151 codes on Ford Expedition 2000 4.6L


Your auto has four O2 sensors. Two upstream and two downstream; With two banks. Bank 1, sensor 1...and bank 2, sensor 1 are the two upstream (exhaust manifold before the catalytic). Bank 1, sensor 2 and bank 2, sensor 2 (other side of catalytic)

Code 1131= upstream; bank 1..sensor 1
Code 1151= upstream; bank 2..sensor 1
Code P0136 (generic code) bank 1..sensor 2 (questionable)

I wouldn't spend the money to purchase 3 sensors. Highly unlikely all three are bad; Cost is about $40/ ea.
Since there isn't a code for the cat's themselves, I would suspect the O2 circuit is malfunctioning. The rough idle is another clue.


Take an ohmmeter set it on X10 scale and measure the resistance from engine to body and body to negative post on battery terminal. You should read zero ohms (full needle deflection). If you do go buy two upstream O2 sensors. If you read
open or a high resistance run two straps from eng. to body...and body to neg.batt. post.

FixYaWIZ................saailer

Dec 10, 2009 | 2000 Ford Expedition

2 Answers

98 E-250 Rough Idle; codes p0156,p1131,p1151,p0301,p0171,p0174+


po301 thru po306 all misfire codes cylinder 1-6 remove plugs and replace them..... set the plug gap first
i suggest u replace the wires also if they never been replaced all these misfire codes can set the others and one is for the oxygen sensor ( 02s or HO2S) CIRCUT MALFUNCTION do u know how to check wireing systems
do the tune up plugs (set gap) .052-.056 change the fuel filter also. clear the codes hows it run
this info is for 98 E-250 4.2Litre
what engine do u have 4.2L or 4.6L i know it is a v-6 by the codes

Dec 15, 2008 | 2003 Ford E250

1 Answer

What is a p1131 code and how do i fix it


P1131, Lack of Upstream Heated Oxygen Sensor Switch - Sensor Indicates Lean - Bank No. 1 ...

MOST LIKELY THE UPSTREAM (BEFORE THE CATALYTIC CONVERTOR) O2 SENSOR IN BANK ONE IS DEFECTIVE, ALSO CHECK FOR ANY ENGINE VACUUM LEAKS, A CAN OF CARB SPRAY HELPS TO SHOW IF ANY LEAKS ARE PRESENT, THE IDLE RPM WILL INCREASE WHEN THE CARB SPRAY HITS A LEAK, IF NO LEAKS FOUND REPLACE THE BANK ONE O2 SENSOR.

Dec 08, 2008 | 1996 Ford Explorer

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