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Need to know which are two upstream o2 sensors on the drivers side

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Upstream means that the O2 sensor is located ahead of the catalytic converter.

Posted on Mar 10, 2009

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Found out I'm missing drivers side upstream o2 downstream was there some help to find the missing wire be awesome


So what kind of help are you looking for?
Year make and model would be helpful for any information.
Some vehicles only have one upstream and one downstream O2 sensor. Older vehicles only have upstream O2 sensors

Apr 19, 2015 | Cars & Trucks

1 Answer

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

2 Answers

2000 navigator system too lean


Too Lean on which Bank of the Motor?

To have a lean O2 Code --you could have a rich fuel
condition & the pcm drove the fuel trim lean

Next you could have a vacuum leak-in the intake or exhaust system

Third you could have a failed O2 Sensor

Front or Upstream Oxygen Sensors get replaced at 100,000 miles

The front sensors are on the exhaust pipe between the motor &
the converter.

Will need a long handled flex head O2 Sensor Wrench

Mar 17, 2014 | 2000 Lincoln LS

1 Answer

P1152 Mustang 2000 GT 4.6 2v 5spd


Going to suggest a few things. Since each side has an identical O2, just switch 1 bank's O2 for the other and see what happens. Maybe replacement part was bad.

Also want to add that wiring of the heater on O2 sensor is not always electrical. Some O2 sensors have hollow wire for heat venting. You say that the shop rewired ECU to O2 but must have used solid core wire to do it. This will not work if you needed a hollow core wire from the O2.

Sep 04, 2012 | Ford Mustang Cars & Trucks

1 Answer

Po135 02 sensor malfuntion bank need location driver side or pasenger side front or rear


Bank 1 sensor 1 this is the upstream O2 sensor closes to the engine on the driver side.

Jul 13, 2011 | GMC Safari Cars & Trucks

1 Answer

95 S10 HAS CODE LOW VOLTAGE BANK 1 SENS O2 SENS


Bank 1 should be the drivers side of the engine.Sensor 1 would be the upstream O2 sensor, or the one before the catalytic converter.Replacing it should take care the problem. You will need to clear the code after replacing the O2 sensor.

Dec 27, 2010 | 1995 Chevrolet S-10 CA Edition

2 Answers

I need to know which is the bank 1 02 sensor


Oxygen sensors are always numbered like this:
Bank 1 sensor 1
Bank 2 sensor 1
Bank 1 sensor 2
Bank 2 sensor 2

Some manufacturers use a kind of shorthand that reads different, but means the same thing:
Sensor 1/1 or O2s 1/1
Sensor 2/1 or O2s 2/1
Sensor 1/2 or O2s 1/2
Sensor 2/2 or O2s 2/2

Bank 1 is always the side of the engine where cylinder number 1 is located and, of coarse, Bank 2 is the opposite side.
On a 4 cylinder engine, there is only 1 bank and it is always referred to as Bank 1.

Sensor 1 is always the upstream sensor (The one located BEFORE the catalytic converter)
Sensor 2 is always the downstream sensor (the one that is located AFTER the catalytic converter.

Hope helps (remember to rate this).

Oct 20, 2010 | Ford Explorer Cars & Trucks

1 Answer

Where are the O2 sensor located on a 1997 Dodge caravan sport' and how many are there?


There are 2 o2 sensors on the caravan upstream+downstream
The downstream sensor is located on the exaust pipe at the
converter. As I don't know what engine you have, the upstream
sensors are located as follows
2.4 on exaust manifold firewall side of engine
3.0 on manifold near alternator
3.3+3.8 center of manifold firewall side

Oct 05, 2010 | 1997 Dodge Caravan

2 Answers

Check engine light


Sometimes can be prematurely dirty air filter, sets off the air flow sensor, which sets off the o2 sensor. So might try new air filter first and erase codes and then see, before you spend more bucks than you need; then if codes return, do the flow mix sensor.

Apr 19, 2009 | 2006 Honda Civic Hybrid

1 Answer

O2 Sensor


Well, Bank 1 is the passenger side of the vehicle. Are you replacing upstream or downstream 02 sensor?

The upstream is in the exhaust manifold. The downstream is further down in the exhaust pipe. Upstream would be designated by the code HO2S1- B1 and the downstream would be indicated HO2S2-B1.

In either case, you basically unplug the wiring connector, use a 7/8 wrench (or an O2 sensor socket which has a groove cut in the side to allow the wiring to not be pinched) and loosen the sensor and install the new one (with anti-seize on the threads) and plug the connector in.

The upstream sensor is pretty easy- the downstream can be a little more difficult, but is not too bad.

Hope this is helpful!!

Nissan Scope Technician- 10+ years experience in Nissan dealership.

Oct 28, 2008 | 2002 Nissan Xterra

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