The oxygen sensor is a critical component of a car’s engine. The code will most likely be set within 30-60 days of the first sensor replacement on most vehicles. If you replace the downstream left sensor, for example, you should also replace the downstream right sensor. Is it necessary to replace all of my oxygen sensors at the same time? It’s best to replace your sensors in pairs. Two two Should I replace all of my o2 sensors at the same time? Where is the fuel pump located on a 2002 Honda Odyssey? What number of oxygen sensors does a 2005 Honda Odyssey have?.Where is the starter located on a 2005 Honda Odyssey?.How many o2 sensors does a 2007 Honda Odyssey have?.Bank 2 Sensor 1 = This O2 sensor is on the side of the catalytic converter with the Cylinder #2, Bank 2, which is located just before the catalytic converter. On the o2 sensor, what is the difference between bank 1 and bank 2.īank 1 Sensor 2 = On the side with the Cylinder #1, which is Bank 1, this O2 sensor is located just after the catalytic converter. If we’re talking about O2 sensors, Sensor 1 is before the Catalytic converter front (upstream O2 sensor) and Sensor 2 is after the Catalytic converter rear (downstream O2 sensor). What is the upstream oxygen sensor’s location? The first sensor is closest to the engine, while the second is at the back of the exhaust system. There are four total sensors: one before each cat and the other after. How many o2 sensors does a 2008 Honda Odyssey have, taking this into account? When the car is in ECO mode, half of the cylinders shut down. How many o2 sensors does a 2007 Honda Odyssey have in addition to that? As far as I’m aware, this Odyssey has two sets of sensors: one for the front cylinders and the other for the rear. In addition, how many o2 sensors does a Honda Odyssey have? A vehicle may have two to five oxygen sensors, or even more. Visit us at for quality auto parts, fast and free shipping, and the best customer service in the industry.Before and after the catalytic converter, oxygen sensors are located. Now that we know which one's which, we can order the right part, correct the problem, and fix you up right. While they are aesthetically different, we can now tell this is my upstream sensor because it looks just like the upstream sensor I have up there. Here I have my two sensors for the vehicle. This could also be located somewhere after the cat. Then we have our downstream or sensor two here inside of the catalytic convertor. We have our upstream sensor here closest to the engine ahead of the cat. On our vehicle here, this is the passenger side, which we've already determined from the firing order is bank one. On inline four-cylinder engines, as long as they have one exhaust manifold like a Jeep four-liter or a four-cylinder Honda engine, you'll only have one bank with an upstream and downstream O2 sensor. These banks are true of V engines like V8s, V6s, and flat engines like Porsches and Subarus that have individual banks. Whichever bank contains cylinder one is going to be bank one, and the other one, regardless of whether or not cylinder two is in it, is going to be bank two by default. Determining which bank is which can be done by looking at a picture of your vehicle's firing order. The other determination you need to make is bank one versus bank two. They then go through the catalytic convertor and to the downstream oxygen sensor, which will either be located in the catalytic convertor like our vehicle here, or after the catalytic convertor to monitor the gasses coming out of the cat and make sure that it's being efficient relative to the readings of the upstream O2 sensor. This means that they see the exhaust gasses first. As the name suggests, upstream sensors will be located upstream or ahead of, in front of, above, closer to the engine than your catalytic convertors. Your oxygen sensor position can be determined relative to your catalytic convertor. The way you determine whether or not an O2 sensor is upstream or downstream is all done visually. But if I had to ask you which one's upstream and which one's downstream, you probably can't tell just from looking at them. I can plug these into either position on our vehicle. While there are some aesthetic differences here, the wire lengths are a little different, the actual body and tip of the sensor are a little different, the threads and gasket are the same, and on the other end the connections are actually the same. In this video I have a couple of oxygen sensors with me. Visit us at, your trusted source for quality auto parts. We're dedicated to delivering quality auto parts, expert customer service, fast and free shipping, all backed by our 100% satisfaction guarantee. We've been selling auto parts for over 30 years.
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