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Where is the upstream oxygen sensor located - 1999 Chevrolet Malibu

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Upstream oxygen sensor or bank 1 as its called is the closest to the exhaust manifold. now for the question back there are usually 4 o2 sensors on a car bank(front)1 sensor 1, bank 1 sensor 2 and (rear) bank 2 sensor 1, bank 2 sensor 2

Posted on Sep 03, 2010

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Posted on Jan 02, 2017

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SOURCE: Upstream O2 sensor location?

That is the first sensor closest to the engine. The downstream sensor is the one behind the converter.
Good luck.
Please rate this response , and let me know if ya need more help!

Posted on Aug 31, 2008

motor1258
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SOURCE: 1997 Dodge Stratus V6 oxygen sensor location

Upstream, as in ahead of the converter, back toward engine. Start at converter and work your way back, should be on exhaust pipe or even on manifold.

Posted on Jan 11, 2009

  • 36 Answers

SOURCE: upstream oxy. sensor signal wire, what color is it?

In my 1990-1995 manual it is Black/Dark Green.

Dark green/orange is 12 V supply, Black is ground, Black/Light Blue also comes from the powertrain control module but is common to many other sensors.

Posted on Dec 28, 2008

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SOURCE: replace oxygen sensors

these engines have 1 upstream o2 sensor and 1 downstream o2 sensor..the 1 in the rear exhaust manifold is the upstream and the 1 after the converter is the downstream..make sure you replaced the right one

Posted on May 16, 2009

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SOURCE: location of upstream and down stream oxygen

exhaust manifold at rear of engine is ur upstream. follow exhaust past cat conv and u will see downstream

Posted on Nov 07, 2009

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PO132 oxygen sensor high voltage bank 1 sensor 1
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PO 134 bank 1 location


Bank 1 is located towards the driver's side. Sensor 1 is located upstream just below the exhaust manifold.
EOBD II Error Code: P0134
Description:
Oxygen Sensor (O2S) 1, Bank 1/Heated Oxygen Sensor (HO2S) 1, Bank 1 - No Activity Detected
Possible Causes:
- Wiring.
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How any oxygen sensors are on a 1999 grand cherokee laredo 4.0 & were is it/they located?


On Grand Cherokee oxygen sensor locations for 4.0 and 4.7 engines, check this diagrams...


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The Oxygen Sensors (O2S) are attached to, and protrude into the vehicle exhaust system. Depending on the emission package, the vehicle may use a total of either 2 or 4 sensors.

Federal Emissions Package (4.0L and 4.7L engines):
Two sensors are used: upstream (referred to as 1/1) and downstream (referred to as 1/2). With this emission package, the upstream sensor (1/1) is located just before the main catalytic convertor. The downstream sensor (1/2) is located just after the main catalytic convertor.


California Emissions Package (4.0L engine):
On this emissions package, 4 sensors are used: 2 upstream (referred to as 1/1 and 2/1) and 2 downstream (referred to as 1/2 and 2/2). With this emission package, the rear/upper upstream sensor (2/1) is located in the exhaust downpipe just before the rear mini-catalytic convertor. The front/upper upstream sensor (1/1) is located in the exhaust downpipe just before the front mini-catalytic convertor. The rear/lower downstream sensor (2/2) is located in the exhaust downpipe just after the rear mini-catalytic convertor, and before the main catalytic convertor. The front/lower downstream sensor (1/2) is located in the exhaust downpipe just after the front mini-catalytic convertor, and before the main catalytic convertor.


California Emissions Package (4.7L engine):
On this emissions package, 4 sensors are used: 2 upstream (referred to as 1/1 and 2/1) and 2 downstream (referred to as 1/2 and 2/2). With this emission package, the right upstream sensor (2/1) is located in the right exhaust downpipe just before the mini-catalytic convertor. The left upstream sensor (1/1) is located in the left exhaust downpipe just before the mini-catalytic convertor. The right downstream sensor (2/2) is located in the right exhaust downpipe just after the mini-catalytic convertor, and before the main catalytic convertor. The left downstream sensor (1/2) is located in the left exhaust downpipe just after the mini-catalytic convertor, and before the main catalytic convertor.

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2 Answers

2/1 oxygen sensor where is it located


The Oxygen Sensors (O2S) are attached to, and protrude into the vehicle exhaust system. Depending on the engine or emission package, the vehicle may use a total of either 2 or 4 sensors.
Federal Emission Packages : Two sensors are used: upstream (referred to as 1/1) and downstream (referred to as 1/2). With this emission package, the upstream sensor (1/1) is located just before the main catalytic convertor. The downstream sensor (1/2) is located just after the main catalytic convertor.
California Emission Packages: On this emissions package, 4 sensors are used: 2 upstream (referred to as 1/1 and 2/1) and 2 downstream (referred to as 1/2 and 2/2). With this emission package, the right upstream sensor (2/1) is located in the right exhaust downpipe just before the mini-catalytic convertor. The left upstream sensor (1/1) is located in the left exhaust downpipe just before the mini-catalytic convertor. The right downstream sensor (2/2) is located in the right exhaust downpipe just after the mini-catalytic convertor, and before the main catalytic convertor. The left downstream sensor (1/2) is located in the left exhaust downpipe just after the mini-catalytic convertor, and before the main catalytic convertor.

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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...


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.

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Were is the heater sensor upstream located on 2001 montana van


The heater sensor I think you are talking about it is the upstream oxygen sensor. Sometimes the code reader just says heater sensor upstream and doesn't tell you its actually the heated oxygen sensor.

Jan 04, 2011 | 2001 Pontiac Montana

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Where is the oxygen sensor located on a lincoln town car 96


My 96 has 4 cat converters, 2 (upstream and down stream) on each side. There are 2 oxygen sensors on each side, before upstream converter and after upstream converter. But make sure they are bad before you replace them (4 of them will cost you about $200), and my 1996 with 175K has 3 original still running. Other sensors (air flow, coolant temp) might be the problem as well.

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Location of upstream and down stream oxygen sensors on 3.8 buick lesabre


They are usually on your exhaust pipe before and after the catalitic converter.

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How many oxygen sensors in a 2001 chrysler sebring 3.0


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

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

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

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

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

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Upstream, as in ahead of the converter, back toward engine. Start at converter and work your way back, should be on exhaust pipe or even on manifold.

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