Question about 1996 Ford Thunderbird LX

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Need to replace oxygen sensor

Which side of my engine (passanger or driver) is bank 1

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Bank one is the passenger side.

Posted on Jun 29, 2008

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Where is Bank 2 sensor 1 oxygen sensor on my 2007 tundra 5.7


Bank 1 is always the sameside of the engine as the number one cylinder.
Bank 2 is always the other side of the engine.
Sensor 1 is always before the cat
sensor 2 is always after the cat.

Cylinder number 1 on this engine is on the drivers side. So bank 2 is the passenger side of the engine and sensor 1 will be located before the catalytic converter.

Nov 17, 2015 | 2007 Toyota Tundra Limited

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Which Oxygen Sensor Is It?


There are many inquiries online about which oxygen sensor to change. Oxygen sensor failure codes are very common on a lot of vehicles. With all of today's vehicles having at least two oxygen sensors and many having three or four of them, it can be a little confusing as to which one is causing the problem.

Before we get into which sensor is which, we need to have a little discussion about oxygen sensor fault codes. There are several different types of oxygen sensor fault codes. Here are just some of the most common ones:

P0135 "Oxygen Sensor Heater Circuit Bank1 Sensor 1"
P0141 "Oxygen Sensor Heater Circuit Bank 1 Sensor 2"
P0147 "Oxygen Sensor Circuit Bank 1 Sensor 3"
P0152 "Oxygen Sensor Voltage High Bank 2 Sensor 1"
P0159 "Oxygen Sensor Slow Response Bank 2 Sensor 2"
P0171 "Oxygen Sensor Lean Sensor 1 Bank 1"
P0172 "Oxygen Sensor Lean Sensor 1 Bank 2"
P0174 "Oxygen Sensor Rich Sensor 1 Bank 1"
P0175 "Oxygen Sensor Rich Sensor 1 Bank 2"

There are many more possible oxygen sensor codes, but I only listed these to make my point. Many times the oxygen sensor code is NOT caused by the oxygen sensor itself. "Lean" or "Rich" oxygen sensor codes (i.e. P0171, P0174) are usually caused by something other than the oxygen sensor. Something is wrong, causing the engine to run lean (not enough fuel or too much air) or causing the engine to run rich (too much fuel or not enough air). In these cases, replacing the oxygen sensor will not fix a thing. (That is, unless you are trying to fix your bank account from having too high of a balance!) The new oxygen sensor will just set the same code as the original one. This is because the oxygen sensor is not CAUSING the problem, it is only REPORTING the problem.

High voltage codes (like P0152 above) can be caused by the oxygen sensor wires being shorted to another wire inside the wiring harness. Sometimes these codes are caused by bad grounds where some other component is trying to ground through the oxygen sensor circuit. Again, replacing the oxygen sensor will not fix this! In short, the problem needs to be diagnosed before running out and buying an oxygen sensor.

Just because a fault code has "Oxygen Sensor" or "O2 Sensor" or "O2S" in its description does not necessarily mean that an oxygen sensor needs to be replaced. Many do-it-yourselfers believe that all there is to fixing the car is to hook it to the "magic box", collect the fault codes and replace the parts the computer tells you to replace. There is nothing further from the truth.

Fault codes only point you toward which SYSTEM is failing. The system must be diagnosed to find the CAUSE of the failure. If this is not done properly, it will only result in wasting a bunch of your money. This is what you were trying to avoid by doing it yourself!

So, after reading all of the above, if you think you still want to replace an oxygen sensor, but don't know which one; here is how to figure it out:

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 #1 is located and, of course, Bank 2 is the opposite side.
On a 4 cylinder engine, there is only one bank and it is always referred to as Bank 1. The exception to the 4 cylinder rule is on certain 4 cylinder engines (specifically, some Toyotas) there are two catalytic converters used. In this case, Bank 1 sensors will still be in the pipe for the catalyst that is connected to cylinder #1 and Bank 2 sensors will be in the other one.

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).
Sensor 3 refers to the ONLY "downstream" sensor where there are two sensors before the catalyst and only one after the catalyst. On very few vehicles the reference to this reads "Bank 1 Sensor 3".

If you do not know where cylinder #1 is, then you need to get a diagram of the firing order for your engine. Just post a question on FixYa.com and make sure you give the YEAR, MAKE, MODEL, and ENGINE SIZE of your vehicle and one or more of our experts will be happy to tell you how to find cylinder #1.

- DTTECH
ASE Certified Master Automobile Technician


Also check out this article by dttech: What Else Could Be Wrong?

on Apr 29, 2011 | Ford F-150 Cars & Trucks

1 Answer

Where is location of bank 1/sensor 1 oxygen sensor v6 ?


Bank 1 means the side of engine which has #1 cylinder in it, which is the left or driver's side of the engine. Sensor 1 means it is the one closest to the exhaust manifold or before the catalytic converter, better known as "upstream" oxygen sensor. On the 4.3 V6 I believe this sensor is mounted in the exhaust manifold itself. You maybe able to access it from underneath the vehicle, or you may have to remove the "doghouse" interior engine access hood. The oxygen sensor has an electrical connector on it that has to be disconnected and the you may need a specialty socket called an oxygen sensor socket. the size of the hex on the oxygen sensor is 7/8".

Apr 27, 2014 | 2003 Chevrolet Astro

1 Answer

How many o2 sensors are on a 1999 Silverado 5.3


The 1999 5.3 V8 engine had 4 oxygen sensors. There are two catalytic converters on this engine, one on the driver side of the engine, and one on the passenger side of the engine. This is important to know, as the number of oxygen sensors is directly related to the number of catalytic converters on the vehicle. Driver side is referred to as Bank 1, passenger side is referred to as Bank 2. This is very important to know when looking up replacement oxygen sensors. There is one oxygen sensor in front of, or before the catalytic converter, usually referred to as a pre-catalyst O2 sensor. There is also one behind, or after the catalytic converter, usually referred to as a post-catalyst oxygen sensor. So, you have two oxygen sensors on Bank 1, and two oxygen sensors on Bank 2, for a grand total of 4 oxygen sensors.

Oct 03, 2013 | 1999 BMW 318 ti

1 Answer

Is bank 1 sensor 1 same side as bank 2 sensor 1


Check this possible engine locations...

3_28_2012_3_12_16_pm.jpg

Hope this helps.

Mar 28, 2012 | 2004 Volvo XC90

1 Answer

Need to find and replace oxygen sensor for 2003 chevy ventue


Need a 7/8 open end wrench or a o2 sensor socket. Located in exhaust pipe. The one closest to the engine is Bank 1 Sensor 1. The ones located downstream and known as "Sensor 2"

Jan 06, 2010 | 2003 Chevrolet Venture Passanger

2 Answers

Need to know location of Bank 1 Sensor 1 on engine


If I am not mistaken bank one should be your driver side. However your sensor one will be before the cat converter. So you just have to find the o2 sensor before the cat converter on the driver side. Good Luck.

Oct 12, 2009 | 2003 Acura 3.2TL

2 Answers

Can't find the bank 1 sensor 1 Oxygen Sensor


bank 1 refers to your driver's side and bank 2 refers to your passanger side. sensor 1 is pre cat and sensor 2 is post cat. Your vehicle has a v-6 so bank 1 sensor 1 is on the drivers side before the catalytic converter. It will be on your exhaust pipe between your exhaust manifold and your catalytic converter.

Jun 27, 2009 | 1999 Mercedes-Benz C-Class

3 Answers

How to locate the oxygen sensor in a LEXUS LS430 (Bank1 Sensor1)


the O2 sensor for bank one sensor one is located between the catalytic converter and the engine in the exhaust head pipe. see photo of your engine cylinder layout, the sensor u want to replace is the one at the cylinder #1 0aa2e73.gif bank on right.

Apr 15, 2009 | 2001 Lexus LS 430

2 Answers

EMISSION FAIL CODES PRESENT P0155


P0155 - Heated Oxygen Sensor Heater Circuit (bank 2, sensor 1)

bank 2 sensor 1 (front, driver side) o2 sensor needs to be replaced

Oct 15, 2008 | Mitsubishi Montero Cars & Trucks

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