Question about 2002 Chevrolet Monte Carlo

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Check Engine Light - O2 Sensor - bank 1 running lean

About 3 weeks ago my check engine light came on with this same code. I replaced the O2 sensor close to the engine and the problem seemed to be resolved. My check engine light came back on two days ago with the same code. We could only locate one O2 sensor. Is there a second? What else could be causing this code to come up besides the O2 sensor?

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  • lanatelle Dec 27, 2008

    check engine test came out, running lean. they cleaned the sensor but happened again. now can hardly drive it. took it in for the weekend to replace with new sensor.. could another serious problem be the case with the running lean code?

  • Anonymous Mar 26, 2014

    check engine light on

  • Anonymous Mar 31, 2014

    seems to flood out no codes comes up unhook the first o2 sensor on pass. side will run but lacks power have replaced 3 o2 sensors but will still do same thing when o2 sensor is plugged back up

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Perhaps cat. converter going bad causing back pressure. Chevy replaces them free up to
100,000 miles.

Posted on Dec 02, 2008

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You should have three oxygen sensors on your car, one for each bank of three cylinders; should be towards the Y pipe on each exhaust manifold. Additionally you should have one on the exhaust pipe before the cadilitic converter.

Posted on Nov 20, 2008

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What do code p1131 mean on a Lincoln Continental 2002


Lack of Upstream Heated Oxygen Sensor Switch Sensor Indicates Lean Bank 1
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Read more: http://www.autocodes.com/search_codes.php?q=p1131#ixzz43ZjTgHzk


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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

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My Service Engine Soon light came on about a year ago. I took it into the shop and got that problem fixed but the light stayed on, so I took it to advance auto parts and code tested it and it said that...


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P0140 Basically this means the an O2 sensor in Bank 1 detected a lean condition, same as mentioned above. Bank 1 is the side where cylinder #1 is.
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Once the problem has been repaired, after 3 start cycle will reset the MIL light. If the O2 is just dirty and slow to heat up try cycling the ignition start 3 times and the light should go off if the O2 sensor does not fail.
Try cleaning the MAF first and see if the light comes off after a few ignition cycle, If the service light is still on you can always have Auto Zone clear the DTC codes and see if it comes back which then check the left and right bank wire harness to the O2 sensors. 
Good luck and hope this helps, keep me posted.

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