Question about 1996 Ford Explorer

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Oxygen sensor on passenger side upstream

How difficult is it to get to the sensor

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Get you the "special" socket available from most parts stores. Jack up the car and reach up and put socket on and unscrew the O2 out of the downpipe.

Posted on Jun 22, 2008

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2 Answers

Is the bank 2 sensor 1 oxygen sensor on a 2010 Saturn outlook on the upstream or down stream side?


The upstream on bank 2, which is the opposite of bank 1. Bank 1 is the side with the number 1 cylinder. Downstream oxygen sensors (after the cat converter) are always sensor 2, as in Bank 2, sensor 2.

Mar 19, 2015 | Saturn Cars & Trucks

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Can an O2 oxygen sensor effect another sensor and give a false reading?


Check which side of your engine has cylinder #1. That side is bank 1. Bank 2 is the side opposite of bank 1. So bank 2 is not always passenger side. And since you seem to have extra O2 sensors, I would replace the other upstream and see what happens. Also the mass air sensor can give a trouble code issue to the upstream 02 sensors. Good luck. I've struggled thru this myself.

Mar 06, 2015 | Cars & Trucks

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Where is bank 2 oxygen sensor on 99 gmc yukon denali


Bank 2 is passenger side. Sensor 1 is the upstream oxygen sensor in front of the catalytic converter and sensor 2 would be downstream under the vehicle

Feb 20, 2015 | GMC Cars & Trucks

1 Answer

What is the best way to remove O2 sensor bank 1 sensor 2?


Here is the low-down on oxygen sensors, and their location designations explained:

Oxygen sensors are screwed into the exhaust system at various points. Some people say that there are 4 oxygen sensors, but technically, that is not correct. Only the front 2 are considered oxygen sensors.

These oxygen sensors are screwed into the exhaust pipe or directly into the exhaust manifold, one on each bank. Because they are in front of the catalytic converter, this is often referred to as 'upstream'.

The other 2 are actually called catalyst monitors. They are oxygen sensors, but they serve a different purpose. They monitor the activities of the catalytic converters, thus the name, catalyst monitors. They are screwed into the exhaust one on each bank, after, or downstream, of the catalytic converters.

On a 4 cyl engine, there are only a total of two such sensors, the one in front of the catalytic converter is the O2 sensor, the one behind the cat is the catalyst monitor.

The location names for them are as follows:
  • On a 4 cyl, the front / upstream is called "bank 1 sensor 1" and the rear / downstream sensor is called "bank 1, sensor 2."

  • On a V6 or V8 engine:

    • the passenger side bank on a forward facing engine, or the bank closest to the firewall on a transverse mounted engine, is bank number 1, so the forward / upstream sensor on that bank would be "bank 1, sensor 1."

    • The driver's side bank (forward facing mount engine), or front bank (transverse engine) would be bank number 2, thus the forward / upstream sensor on that bank would be "bank 2, sensor 1," and the rearmost / downstream sensor on that bank would be "bank 2, sensor 2."

Jul 28, 2012 | 2004 Mitsubishi Endeavor

4 Answers

Where is bank1 and bank 2 located on a lincoln LS?


Bank #1 passenger side

Bank #2 driver side

Replace the front (2) converter inlet O2 Sensors,
when they get to 100,000 miles

Aug 04, 2011 | 2002 Lincoln LS

1 Answer

P 0051 on dodge dakota trouble code


Bank 2 sensor 1 oxygen sensor heat circuit low. Look for broken wires or corrosion on connecter to the upstream O2 sensor on passenger side. If no apparent breaks or corrosion replace that oxygen sensor.

Mar 21, 2011 | 2001 Dodge Dakota

1 Answer

How many oxygen sensor on a 02 chevy blazer


Hi, there are 4 sensors on your truck--two upstream and 2 downstream. The upstream sensors are mounted in the exhaust manifolds and the downstream sensors are mounted just behind the catalytic converters. The upstream and downstream sensors are different. Bank 1 is on the driver's side and bank 2 is on the passenger's side. Please let me know if you have more questions, and thanks for using FixYa.

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Jan 01, 2011 | 2002 Chevrolet Blazer

1 Answer

I have a 1997 ford expedition with a 5.4 liter and i just hooked it up 2 a trouble shooter and it gave me the codes 1131 and 1132 and I need 2 no what those codes r please..


P1131 Lack Of Upstream Heated Oxygen Sensor (HO 2 S 11) Switch, Sensor Indicates Lean (Bank #1)
P1132 Lack Of Upstream Heated Oxygen Sensor (HO 2 S 11) Switch, Sensor Indicates Rich (Bank#1)

Check connector and wiring on your sensor. Upstream bank 1 sensor is on passenger side at the bottom of the exhaust manifold. If it looks good, the sensor may have failed internally.

Nov 27, 2010 | Ford Expedition Cars & Trucks

2 Answers

Oxygen sensor confusion


1/1 is upstream sensor on the number 1 cylinder side, 1/2 is the downstream of the number 1 cylinder side, 2/1 is the upstream of the number 2 cylinder side, 2/2 is the downstream of the number 2 cylinder side. Hope this helps.

Aug 10, 2009 | 2003 Jeep Grand Cherokee

2 Answers

Check engine light codes, p0171, p0174. forde explorer 2003 sport


this fords have very comun problems with maf sensors geting contaminated, if you have not or can hear any vacium leaks, the problem is goin to be a conataminated mas air flow snsor (maf)
allow the engine to cold down for at least 15minutes and the remove the air filter hosing and inside has to have a sensor, clean the two liitle resistors inside with brake or carburetor cleaner, allow it to dry and reinstall it.
if this inf help please mark it as fixya ranking after you try what i said

Jun 30, 2008 | 2003 Ford Explorer Sport

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