![]() ![]() 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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