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Check Engine Light came on. Had a dianogistic check indicating faulty Oxygen Sensor. Exactly where is the sensor located...was told 'upstream or downstream' of catalyic convertor. Accessible from under the vehicle or from inside under the opened hood? Thanks...John Castelluccio

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Oxygen sensors are located in your exhaust usually 2 - 1 upstream (in front of cat.converter) 1 downstream (behind cat.converter) and from under the vehicle.

Posted on Mar 15, 2011

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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

How to fix error code P0153 Slow Response Bank 2 Sensor


This involves the oxygen sensor upstream the catalytic converter on Bank 2. This code indicates the engine air fuel ratio is not being adjusted by the oxygen sensor signal or the ECM as expected to do so, or not adjusted as often as expected to do so once the engine is warmed or under normal engine use. You will likely not notice any drive ability problems, although there may be symptoms. A code P0153 may mean that one or more of the following has happened: The oxygen sensor is faulty The wiring to the sensor is broken / frayed There is an exhaust leak Possible Solutions Things that may fix the problem include: Check and fix any exhaust leaks, Check for wiring problems (shorted, frayed wires), Check the frequency and amplitude of the oxygen sensor (advanced), Check for a deteriorating / contaminated oxygen sensor, replace if necessary, Check for inlet air leaks, Check the MAF sensor (sensor of the pipe from air cleaner) for proper operation, Replace the Bank 2 oxygen sensor upstream of the catalytic converter (follow from CC towards engine - you wil see the sensor)

Aug 18, 2014 | 1999 Isuzu Rodeo

1 Answer

Chevy Silverado error p1151


P1151 Lack of Upstream Heated Oxygen Sensor Switch - Sensor Indicates Lean - Bank No. 2


p1131 p1151 p0171 p0174 p1131 p1151 p0171 p0174
All of these p1131 p1151 p0171 p0174 codes indicate a problem with a lean condition. This engine is known for vacuum leaks, so before you start throwing oxygen sensors at the problem, it pays to perform some diagnostics.
Start by cleaning the MAF sensor. Spray the sensor with CRC MAF sensor cleaner. Next, check the plastic vacuum lines, especially where they meet with rubber boots. If they are cracked or the rubber is swollen, replace the line. Then check the rubber elbow that holds the PCV valve. That elbow is a know failure point. In fact, the entire PCV tubing is a trouble spot on these engines. (thanks Ford).
After you've checked for vacuum leaks, check the operation of the oxygen sensors. The easiest way to do that is to disconnect the sensor from the harness. Connect one lead of your digital voltmeter to the black wire on the sensor and the other lead to battery negative. Then start the engine and add fuel (either propane, starting fluid, or carb cleaner) into the throttle body to force the mixture to rich. You should see a corresponding increase in voltage as you add fuel (from 0 volts to slightly less than 1 volt). Start and stop the fuel enrichment and watch the meter to see if the volts drop as you stop adding fuel. If you see no change, the sensor is dead. Replace it.
You can also use the fuel enrichment procedure to locate intake gasket leaks.
P1131 Lack of Upstream Heated Oxygen Sensor Switch - Sensor Indicates Lean - Bank No. 1
P1151P1151 Lack of Upstream Heated Oxygen Sensor Switch - Sensor Indicates Lean - Bank No. 2
P0174 system lean bank 2
P0171 system lean bank 1


This is the only info that didn't come back directly to FORD (yet still mentions it) instead of GM. Not to sure you got the correct code.

Jul 08, 2014 | 1999 Chevrolet Silverado 1500

1 Answer

Upstream heated O2 sensor heater fault


check the fuses if the fuse blew the heated side of the sensor will not work and still kick the code also a v-6 has 2 upstream o2 sensors

Oct 01, 2012 | 1997 Mercury Villager

2 Answers

I am thinking about buying a 1996 ford taurus from my grandmother but the check engine light is on. I have taken it to the parts store and had a diagnostic run and they told me that it read p1131 and...


Those codes are for a "lack of switching" on the heated oxygen sensors. First thing to look at is the the MAF sensor. It is in the intake hose after the air filter but before the intake manifold. take it out and clean it with ELECTRONICS cleaner only DO NOT use carb/brake cleaner. Let it dry for 15-20 minutes and then re-install. Disconnect the positve battery cable to clear the code and then drive it. If the light comes back on and the same code is retrieved then you might have a bad MAF sensor.

Jan 01, 2011 | Ford Taurus Cars & Trucks

1 Answer

Hey guys im pulling a p0138. i have a 99 jeep cherokee limited i checked the 15 amp fuses and replaced the upstream and downstream o2 sensors and it still keeps popping up. The check engine light is still...


Harness or connectors (The sensor circuit is open or shorted). Rear heated oxygen sensor (Bank 1) may be faulty. The rear heated oxygen sensor (or sensor 2), after three way catalyst (manifold), monitors the oxygen level in the exhaust gas on each bank. Check your connections and make sure the right sensor is in the right location.

Dec 30, 2010 | 1999 Jeep Cherokee

1 Answer

My 1999 honda odyssey have a light on in the check engine, i went to the mechanic & plug it to the small computer, the computer said no response to code P0138B BANK 1 SENSOR 2 HIGHT VOLT, the mechanic...


There is are upstream and downstream O2 sensors. 1 or 2 (upstream) before the catalytic converter which sends signals for closed loop fuel control and OBD II monitoring, and 1 (downstream) after the catalytic converter, which is used to monitor the catalytic converter operation. The PCM monitors the signal from each O2 sensor.

Nov 02, 2010 | 2006 Honda Odyssey

2 Answers

How many oxygen sensors in a 2001 chrysler sebring 3.0


17c3292.jpg

Fig. Heated Oxygen (HO2S) location (sensor 1)-2.4L engine

db6f426.jpg

Fig. Heated Oxygen (HO2S) location (sensor 2)-2.4L engine

99e413c.jpg

Fig. Heated Oxygen (HO2S) location (bank 1, sensor 2) (bank 2, sensor 2)-2.7L engine

e2a250f.jpg

Fig. Heated Oxygen (HO2S) location (bank 2, sensor 1)-2.7L engine

I hope help you with this (rated this help). Good luck.

Sep 09, 2009 | 2001 Chrysler Sebring

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