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Engine light stays on and error code P1131 was read by diagnostics. What's the most probable cause?

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3 Answers

What do code p1131 mean on a Lincoln Continental 2002


Lack of Upstream Heated Oxygen Sensor Switch Sensor Indicates Lean Bank 1
In simple terms, it means the engine computer is not "seeing" the O2 sensor switch from rich to lean like it should be doing.
When the O2 sensor switches to lean the computer makes the injectors open more to let in more fuel, until the sensor switches to rich.

Read more: http://www.autocodes.com/search_codes.php?q=p1131#ixzz43ZjTgHzk


Mar 21, 2016 | Lincoln Cars & Trucks

2 Answers

What does code p1131 mean on a 2001 ford taurus


P1131 Ford
P1131 Ford - Lack of Upstream Heated Oxygen Sensor Switch Sensor Indicates Lean Bank 1

Repair Importance Level: 3/3

Repair Difficulty Level: 2/3

http://engine-codes.com/p1131_ford.html

Forum Code

Possible causes

- Faulty Oxygen Sensor

- Vacuum leak affecting bank 1 only

- Fuel injector problem bank 1

- Check for cylinder misfire on bank 1

- Engine mechanical condition

Tech notes

Though the Oxygen (O2) sensor, the Engine Control Module (ECM) has detected a lean system, which means that there is either not enough fuel or and excessive amount of air in the system. Start by checking for vacuum leaks.

When is the code detected?

The Engine Control Module (ECM) detected bank 1 oxygen (O2) at its lean limit

Possible symptoms

- Engine Light ON (or Service Engine Soon Warning Light)

P1131 Ford Description

A Heated Exhaust Oxygen (HO2S) sensor indicating rich at the end of a test is trying to correct for an over-lean condition. The test fails when the fuel control system no longer detects switching for a calibrated amount of time.

Read more: http://engine-codes.com/p1131_ford.html#ixzz3izk89wMu

Aug 16, 2015 | Ford Cars & Trucks

1 Answer

I am getting diagnostic code 22


Error Code: 22
Description: Engine Coolant Temperature circuit malfunction.
Possible Causes:
- Wiring.
- Coolant Temperature sensor defective.
- ECM.

Apr 25, 2014 | 1993 Jeep Grand Cherokee

1 Answer

Diagnostic code p2195 and p1131 for ford focus 2007?


P1131-- Lack of HO2S-11 Switch ,Sensor Indicates lean

P2195-Lack of HO2S-11 Switch,Sensor Indicates Lean


If you have one or two front upstream sensors & have 100,000 miles
on them, replace them as preventative maintenance

The codes are for an Oxygen Sensor closest to the engine,
on the side #1 Cylinder is on

Sensor Codes could be caused buy a leaking injector,
low fuel pressure,running out of fuel,EGR problem,Exhaust
leaks before sensor or converter,any vacuum leak,& other issues

Remove the spark plugs to see if they are fouled from fuel

You can not fix an injector with any fuel tank additive
They have to be removed & mailed away to be cleaned
if they stick open,you could install one if it leaks & is the
only issue.

Oct 01, 2012 | 2007 Ford Focus 1.8

1 Answer

Code p1131 please help


P1131 - Lack Of HO2S Switch - Sensor Indicates Leanxicon.jpghttp://engine-codes.com/p1131.htmlForum CodePossible causes- Vacuum leak affecting bank 1 only
- Fuel injector problem bank 1
- Check for cylinder misfire on bank 1
- Engine mechanical condition
- Faulty O2 sensor. Symptoms- Engine Light ON (or Service Engine Soon Warning Light)P1131 Description A Heated Exhaust Oxygen (HO2S) sensor indicating lean at the end of a test is trying to correct for an over-rich condition. The test fails when the fuel control system no longer detects switching for a calibrated amount of time.

Jul 25, 2012 | 2009 Tata Indigo GLS

1 Answer

What are engine codes p1131 and p1151 mean?


P1131-- Lack of HO2S-11 Switch (lean)
P1151--Lack of HO2S-12 Switch (lean)

There are at least 26 possible causes in the
Diagnostic Trouble Code Chart

That isn't going to be a driveway job,
your going to resolve

Mar 12, 2011 | Ford F-150 Cars & Trucks

1 Answer

1998 mercury sable wagon with the V6 Duratec engine getting a P1131 reading what is it


its running lean on bank 1, eitehr a vacuum leak, or an o2 sensor.

http://www.denlorstools.com/autoblog/2009/07/ford-p1131-p1151-fault-codes-30-dohc-o-2-diagnostics/

Sep 03, 2010 | 1998 Mercury Sable

1 Answer

My 1998 Ford Contour 2.0L 157k Check Engine Light P1131


These codes are dealer specific. Please call you local dealer and they will give you the exact meaning.

For now I think you may find the code needs to be verified.
Here is my advice.
Have the reading done by - Auto Zone and also Advance Auto all over again. If the codes match
Take down the vin# - call the dealer and tell them the code. Ask them what it means and - -ask if your vin# brings up and recalls or service needs as issued by the factory. Some things never go out of date.

One last this - your header here says 1995 -your note says 1998. You need to sort that out as well.

Jan 28, 2010 | 1995 Ford Contour

3 Answers

How to clear code service engine soon 2002


you need to use an OBDII scan tool that will read any "error" codes and give you the system that will be causing the check engine light to come on. this tool will also allow you to erase the code after you have read it. write the code down as you may have to pinpoint exactly what part may have failed and needs replacing. something as simple as a loose gas cap will cause the check engine light to come on. it could be any of a dozen different emission or ignition sensors that may be bad depending on the error code. all 1996 and newer vehicles sold in the US will have the OBDII system and standard diagnostic/data link connector,which is usually under the driver side of the dash, to plug the scan tool into to read the DTC's(diagnostic trouble codes).

Aug 29, 2009 | 2002 Pontiac Bonneville

1 Answer

Same issue as above, except on a 2002 Taurus.


P1131 (Fault Location) Heated oxygen sensor (HO2S) 1, bank 1, bank 1-not switching, fuel trim (FT) weak mixture (Probably Cause) Wiring, intake/fuel system, HO2S, EGR system, oil level, camshaft timing, cylinder compression, ECM. Could be any one of these. Is your oil level ok on your dip stick?

Jul 31, 2009 | 2002 Ford Escape

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