Planar technology helps reduce emissions. Downstream: location is between the catalytic converter and the tailpipe. How are the oxygen sensors identified on a scan tool? When displayed on a scan tool, the right and left upstream oxygen sensors are typically labeled Bank 1, Sensor 1 and Bank 2, Sensor 1. The Bank 1 sensor will always be on the same side of a V6 or V8 engine as cylinder number one. On a scan tool, the downstream sensor on a four or straight six cylinder engine with single exhaust is typically labeled Bank 1, Sensor 2.
Or, the downstream oxygen sensor might be labeled Bank 1 Sensor 3 if the engine has two upstream oxygen sensors in the exhaust manifold some do to more accurately monitor emissions. It's important to know how the O2 sensors are identified because a diagnostic trouble code that indicates a faulty O2 sensor requires a specific sensor to be replaced. Bank 1 Sensor 1 might be the back O2 sensor on a transverse V6, or it might be the one on the front exhaust manifold.
What's more, the O2 sensors on a transverse engine might be labeled differently than those on a rear-wheel drive application. There is not a lot of consistency as from one vehicle manufacturer to another as to how O2 sensors are labeled, so always refer to the OEM service literature to find out which sensor is Bank 1 Sensor 1 and which one is Bank 2 Sensor 1.
This information can be difficult to find. Some OEMs clearly identify which O2 sensor is which but others do not. If in doubt, call a dealer and ask somebody in the service department.
What's the difference between a "heated" and "unheated" oxygen sensor? Heated oxygen sensors have an internal heater circuit that brings the sensor up to operating temperature more quickly than an unheated sensor. An oxygen sensor must be hot about to degrees F before it will generate a voltage signal. The hot exhaust from the engine will provide enough heat to bring an O2 sensor up to operating temperature, but it make take several minutes depending on ambient temperature, engine load and speed.
During this time, the fuel feedback control system remains in "open loop" and does not use the O2 sensor signal to adjust the fuel mixture. This typically results in a rich fuel mixture, wasted fuel and higher emissions.Log In or Create Account Optional.
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Bank 1 VS Bank 2 – Sensor 1 & 2 O2 Sensor Location
Mobile Site. Manufacturer names and logos in the RockAuto catalog are trademarks of their respective companies and are used only to identify their products. All rights reserved. Oxygen O2 Sensor. Emission Repair Manual. Fuel Injector. Oxygen O2 Sensor Thread Repair. Add to Cart. Downstream; Bank 1 Sensor 2.
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Downstream; without California Emission System. Downstream; Bank 1 Sensor 2; Federal Emissions. Please create a password for your account. Please set a password for your account. Security Code. Password New Password. Confirm New Password. Keep Me Logged In. Gift Certificates. About Us. Repair Index Calculator. Show Quick Cart. Front Rear Upstream Downstream Unspecified. Intentionally blank. No parts for vehicles in selected markets.Oxygen sensors, also known as the O2 sensors, are one of the most replaced sensors in a vehicle, as they have a short life span.
But even then, you cannot risk, not replacing them in time, as they are an important component when it comes to the working of the vehicle. If one of these O2 sensors has stopped working, you need first to find which one it is, locate it and then get it replaced or fixed. In this article, we will be discussing two different methods that are mostly used to locate O2 sensors. O2 sensors are first divided into two categories; bank 1 and bank 2. Due to this, a lot of people have trouble locating which O2 sensor is bank 1 and which O2 sensor is bank 2 and in confusion, they sometimes even end up replacing the wrong sensors which cost them both money and time.
We will be clarifying each one in detail so that you have no trouble using either of the two methods to locate the right sensors successfully. We will explain in detail bank 1 and bank 2 sensors and also sensor 1 and sensor 2 so that from next time onward you are able to locate and then replace the right sensors.
The cylinders in the engine are mostly divided into two parts. If the engine in your car is V-engine, then it will have one bank on each of the two sides of the engine. The right way to tell which side is Bank 1 and which side is Bank 2 by using the following method:. Bank 1: It is the side which has the 1 cylinder. For instance, Cylinders 1 — 3 — 5 — 7. Bank 2: It is the side which has the 2 cylinder.
For instance, Cylinders 2 — 4 — 6 — 8. There are two types of Engines, inline engines and transverse engines engines that are mounted in other directions. Now the next problem that arises is how to be able to tell the number of a cylinder. In order to be able to do that, this is what you got to know first.
Some of these different ways are mentioned below:. The number will be stamped on the crankcase. In some cases, they got the numbers written on them. So they might not be in the right positions. The dealer might have some information about that as well. The sensor number is supposed to tell us where the O2 sensor or the Exhaust temperature sensor is located or mounted on the exhaust system. The 1st sensor is always located the closest to the engine, and the second is always located at the rear end of the exhaust system.
In the case of more than 2 sensors, such as in diesel engines as they need a lot of exhaust temperature sensors, there might be sensor etc. In such a case, sensor 1 is located nearest to the engine, and the last sensor is located at the rear end of the exhaust system.
You can also find the right sensor using an OBD2 scanner. This can cause problems like low emissions and bad fuel economy, as mentioned above. It might even result in the failing of the catalytic converter.
Keep in mind that the new replacement O2 sensors must also be of the same type as the original ones installed in the vehicle with the same number of wires. Otherwise, that too will cause you problems. If even one of the O2 sensors, on your high-mileage vehicle, has come to the end of its span, the chances are that the other sensors might also be nearing the end of their lives and should be replaced as well at the same time in order to restore the performance.
Therefore, as you can see, it is highly important to get these sensors replaced before they become a big problem. You can identify the problem by keeping an eye out for indicators. Faulty O2 sensors can cause you a lot of trouble, if not replaced in time. Therefore, as soon as you get an indication that the sensor might be faulty, locate it, get it checked and then replaced.
Bank 1 VS Bank 2 – Sensor 1 & 2 O2 Sensor Location
You can use either of the two methods and follow them step-wise to be able to locate the sensors. As the formal owner of a full-service and repair dependent review industry, he's been around a lots of tools and accessories of Cars, Trucks, SUVs.Skip to main content. Related: o2 sensor. Include description. Brand Type. Private Label 51 Items Genuine OEM 38 Items Aftermarket Branded 27 Items Unbranded 19 Items Not Specified 74 Items BMW 15 Items Catinbow 14 Items Toyota 11 Items No Warranty 3 Items 3.
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Free Local Pickup. Show only.But, there are four oxygen sensors on this vehicle.
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Which sensor is it? Lucky for us, there are a few standards in the industry that can help us avoid diagnostic vertigo. It is important to note that when ordering a part that is labeled left or right, there are standards across the industry as well.
The left and right of the engine are always going to be viewed while standing at the rear of the engine and looking towards the front. In the automotive world, Bank 1 refers to the number one cylinder bank, which means it is the bank where the number one cylinder is located. On an inline four cylinder engine, this is the only cylinder bank.
On an inline six cylinder engine, you may see two banks being represented in the scan tool data, when in theory there is still only one actual cylinder bank. A good example of this is the BMW M54 engine, where two separate exhaust manifolds are used in a single cylinder bank layout. On the M54, the front three cylinders contain the number one cylinder, so this is referred to as bank 1. Likewise, the rear three cylinders are referred to as bank 2.
On engines with opposed cylinder banks, such as a V8 engine, the rule is the same, being that bank one is always the bank containing the number one cylinder. You will need to consult the service manual to find out the cylinder layout for each particular engine. As far as oxygen sensor location goes, things are quite simple. Sensor 1 is the upstream oxygen sensor. Sensor 1 is the sensor closest to the engine. Sensor 2 is the downstream oxygen sensor.
It is always going to be located after the catalytic converter. Its job is to monitor the oxygen content exiting the catalytic converter in order to determine if it is operating efficiently. In some cases, there will be a Sensor 3.
Sensor 3 is found on some Ultra Low Emissions Vehicles, and will be located after the post-catalytic converter. Component locations can be misleading at times. Knowing where to look can help save both time and money when performing repairs on your vehicle. Bank 1, Sensor 1? Upstream or Downstream? Articles Menu. Read Articles Service culture diy diagnostic specials repair tuning Read Articles by Make alfa romeo audi bmw cadillac chevrolet chrysler dodge fiat ford hummer hyundai infiniti innovations repair tuning isuzu jaguar jeep kia land rover lexus mazda mercedes-benz mini mitsubishi nissan porsche range rover saab subaru toyota volkswagen volvo.This means there is a problem on the O2 sensor on bank 1, and it fails to decrease the time needed to enter closed loop.
Error Code P by definition means the heated circuit of the bank 1 O2 sensor reduces the time required to make a closed loop. As the Oxygen sensor reaches the temperature needed to operate, the O2 sensor responds by changing according to the O2 content of the exhaust around it. There may be no noticeable symptoms that can affect the performance of the vehicle, so take note of its common symptoms such as:.
Most often than not, it results in a P code, which means failed converter problem. First thing you need to do to diagnose your vehicle for this error code is to check whether the oxygen sensor heater has failed. This means you need to raise your vehicle to check it. There are a couple or more ways to check for this problem, but in this entry, we will only discuss the easiest route. Start by making sure the Oxygen heater sensor gets power.
Test the circuits of the Oxygen sensor harness connector, which is the connector on the engine wiring harness. First Step — Raise the vehicle off the ground using jack stands. Always use jack stands to support the vehicle. Second Step — Unplug the rear O2 sensor. Your vehicle has two O2 sensors, one before the catalytic converter, and another after it. In this test, we will check the sensor after the catalytic converter. Third Step — Find the Pink wire.
If the Pink wire gets 10V to 12V — this means the heater element in the oxygen sensor receives power. Many times when the fuse is damaged, your scan tool will also register Error Code P DTCsince it also feeds the front O2 sensor with power.
At this stage, you need to check the Ohming of the Oxygen element heater, which would be Test 3. Note that you may need to check the entire black wire with white stripe between the PCM connector and the O2 sensor connector.
This test checks whether the O2 sensor for bank 1 sensor 2 if fired or not. First Step — Unplug the O2 sensor from the wiring harness connector of the engine.
Remember that you are testing the O2 sensor, and if everything is good, you should have 4. If it shows the letters OL, then that means your heater element is damaged fried. You may also need to fix short or open or high resistance in harness connectors or wiring harness.
For more information about this error code, or other error codes, feel free to Contact US. Remember me. Table of Contents. Subscribe to our mailing list.Our mobile mechanics offer services 7 days a week. Upfront and transparent pricing. Average rating from customers who received a Oxygen Sensor Replacement.
Learn More. Our certified mobile mechanics can come to your home or office 7 days a week between 7 AM and 9 PM. It depends on the type of car you drive and the auto repair shop you go to. Our mechanics are mobile, which means they don't have the overhead that repair shops have. They provide you convenience by coming to your home or office. With each new model year, manufacturers are adding more oxygen sensors to better manage engine operation. Some high performance engines have an oxygen sensor for each cylinder as well as one for the rear of each catalytic convertor.
The sensors are located either underneath the hood or underneath the car. The oxygen sensors are connected screwed to the exhaust pipe, either in front or back of the catalytic converter. The front upstream sensors measure the amount of oxygen in the exhaust system. The purpose of the front oxygen sensor s is to measure how rich or lean the gases are as the gases exit the combustion chamber.
Depending upon whether the exhaust gas is lean high in oxygen content or rich low in oxygen contentthe amount of fuel entering the engine is adjusted by the engine management computer to try and maintain an ideal mixture that produces the lowest emissions output from the catalytic convertor.
Rear downstream sensors are located behind the catalytic converter. The purpose of the rear oxygen sensor s is to monitor the oxygen content of the exhaust gases leaving the catalytic convertor. If one or more of the oxygen sensors are faulty, your car may not pass the emissions test.
If you drive your car with a faulty oxygen sensor, you may get poor gas mileage and it can damage the catalytic converter. Keep up with the tune-ups. If check engine light is on, don't drive the car too long without getting it inspected. If check engine light is flashing, pull over and get the car towed to avoid costly repairs. Ask the mechanic to inspect the vacuum hoses and leaks in the exhaust system. If the vacuum hose or exhaust system is leaking, it will display an oxygen sensor fault code.
Error Code P0136: Oxygen Sensor Circuit Low Voltage – Bank 1 Sensor 2
Replacing an oxygen sensor may not fix the problem. Your vehicle has multiple oxygen sensors, and they all help the car run optimally. The front sensors measure how much oxygen is in the exhaust stream to measure how rich or lean the gases leaving the gas chamber are. The rear sensors measure the oxygen content of the gases as they leave the catalytic converter.
Because cars depend on an ideal fuel-to-air ratio to function optimally, the oxygen sensors are leaned on for engine performance.
When your oxygen sensors fail your car will run less smoothly, get worse mileage, and have worse emissions. With YourMechanic you can skip the auto shop altogether. They send certified and screened mechanics straight to your door and enable you to save big on car repair and maintenance. Oxygen Sensor Replacement at your home or office Our mobile mechanics offer services 7 days a week. Get an upfront price. Service Location. YourMechanic Benefits Online Booking.