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I have a 07 f150 4.6L V8 and I need to replace the Bank 1 sensor 1 oxygen sensor but cant figure out which sensor it is since there are 4 sensors. Where can I find a picture of the location?

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  • Ford Master
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Heated Oxygen Sensor (HO2S)- The Bank 1 Sensor 1 tells me that it's an upstream O2 sensor. The larger the number the further down the line of the exhaust it is. Removal & Installation 4.2L Engine I have a 07 f150 - ford-04-42-2750.gif
To Remove:

  1. Raise and safely support vehicle.
  2. Disconnect battery ground cable.
  3. Detach electrical connector from right inner fender splash shield (if necessary).
  4. Remove right inner fender splash shield (if necessary).
  5. Disconnect heated oxygen sensor electrical connector.
  6. Remove heated oxygen sensor.
To Install:
  1. Apply anti-seize lubricant to heated oxygen sensor threads.
  2. Install heated oxygen sensor. Torque to: 34 ft-lbs (46 Nm)
  3. Connect heated oxygen sensor electrical connector.
  4. Install right inner fender splash shield (if necessary).
  5. Attach electrical connector to right inner fender splash shield (if necessary).
  6. Connect battery ground cable.
  7. Lower vehicle.
4.6L and 5.4L Engines
To Remove:
  1. Raise and safely support vehicle.
  2. Disconnect battery ground cable.
  3. Disconnect heated oxygen sensor electrical connector.
  4. Remove heated oxygen sensor.
To Install:
  1. Apply anti-seize lubricant to heated oxygen sensor threads.
  2. Install heated oxygen sensor. Torque to: 34 ft-lbs (46 Nm)
  3. Connect heated oxygen sensor electrical connector.
  4. Connect battery ground cable.
  5. Lower vehicle.

Posted on Nov 07, 2010

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What is a bank sensor for a honda civic ls 04


O2 sensor bank 1 sensor 1 should actually be read as: O2 sensor, bank 1, sensor 1. Meaning the first oxygen sensor (O2 sensor #1) on cylinder bank #1 (it's a Honda inline 4 -cylinder engine, so it only has one bank of cylinders; a V6 or V8 engine would have tow banks arranged in a V shape) needs to be replaced. The oxygen sensor will be threaded into the exhaust near where the manifold (or possibly threaded in at the manifold itself) with some wires coming out of it. In the photo, the O2 sensor is labelled as the air/fuel ratio sensor. 5478b94e-7fcc-4726-9bba-653a172e5a92.jpg

Jun 23, 2014 | 2000 Nissan Frontier

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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

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

Cant find base1 sensor2 on a 96 ford explorer 6 cylinder 4 wheel drive


It's called bank, not base. On a v6 or v8, each side of the engine is called a bank. Bank 1 is always the side where the number 1 cylinder is located. On Fords, number 1 is on the right bank or side, the right as if you were sitting in the vehicle, so well, the passenger side.
Sensor 2 is the oxygen sensor in the exhaust stream after the catalytic converter (somebody recently called it the cadillac converter!). You have two oxygen sensors on the right bank, one before the cat and sensor 2 is after the cat. The only purpose of sensor 2 is so the computer can monitor the efficiency of the catalytic converter. It compares the readings from sensor 1 and sensor 2. Sensor 1 information is how the computer adjusts fuel trim.

Sep 27, 2013 | 1996 Ford Explorer

1 Answer

2002 chevy express van 5.7 v8 error code PO154 Bank 2 sensor 1 oxygen sensor


That is a low signal error from the right bank upstream oxygen sensor. In most cases, it is caused by a weak oxygen sensor. Before replacing the oxygen sensor, double check fuel pressure, volume and quality. A low signal from the oxygen sensor can also be caused by a lean fuel condition.

Sep 10, 2013 | 1996 Chevrolet K1500

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

1 Answer

Check engine light on my 02 toyota tundra stays on. Diagnostics say I need to replace heated oxygen sensor, bank 2 sensor 1.


Bank 2 will be the side that DOESN'T have the #1 Cylinder..Sensor 1 will be the one BEFORE the catalyitic convertor. On your car if it is a V6 then Bank 2 is the DRIVERS side, and if it's a V8 then Bank 2 is the PASSENGER side.

Jun 26, 2011 | Toyota Tundra Cars & Trucks

1 Answer

Where is bank 1 sensor 2 on f150 4.6 Eng. .


Diagram: Ford Explorer and V8 O2 (Oxygen) Sensor Locations

Ford Explorer and V8 O2 Sensor Locations diagram. This shows the location of Ford oxygen sensors on Bank 1 and Bank 2. If you want to know where your O2 sensors are, this diagram is your guide.

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Hope helps.

Feb 14, 2011 | 1997 Ford F150 Regular Cab

1 Answer

My 2003 Kia Optima check engine light keeps coming on. I was told "Bank 1 Sensor 1" needs to be replaced. Where is Bank 1 Sensor 1?


P0130 Oxygen Sensor Circuit Malfunction - Bank 1 Sensor 1.
P0131 Oxygen Sensor Circuit Low Voltage - Bank 1 Sensor 1.
P0132 Oxygen Sensor Circuit High Voltage - Bank 1 Sensor 1.
P0133 Oxygen Sensor Circuit Slow Response - Bank 1 Sensor 1.
P0134 Oxygen Sensor Circuit No Activity detected - Bank 1 Sensor 1.
P0135 Oxygen Sensor Heater Circuit Malfunction - Bank 1 Sensor 1


Jun 23, 2010 | 2003 Kia Optima

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