![]() ![]() This is most easily understood by envisioning a vehicle’s exhaust as a flowing creek.Ī vehicle’s catalytic converter would be located after a particular engine bank’s “upstream” O2 sensor, yet before the “downstream” O2 sensor on the same bank. Simply put, the terms upstream/downstream are used to describe the positioning of a vehicle’s O2 sensor to the exhaust’s catalyst, with consideration of the direction of exhaust flow. One of these two sensors will be positioned before (upstream) the inlet of a vehicle’s exhaust catalyst, while the other will be positioned to the rear (downstream) of this same catalyst. In the bulk of situations, a vehicle’s exhaust will feature two independent oxygen sensors for each engine bank. The second designation used to describe the location of a vehicle’s O2 sensor relates to its upstream versus downstream orientation. Upstream vs Downstream Example where cylinder #1 is on the right (passenger) side. In other cases, it might be necessary to locate the factory-specific service literature for your particular vehicle when attempting to determine one engine bank from another. Some engines are labeled along their blocks, providing consumers with data regarding the engine’s bank orientation. Regardless, the term “bank 1” is used to describe the engine bank housing the first cylinder. For example, many V8 engines are arranged with cylinders #1, #3, #5, and #7 on one bank (bank 1), while cylinders #2, #4, #6, and #8 will be located on the other (bank 2). When dealing with “V” configuration engines, one specific side of the “V” will be referenced as bank 1, while the other will be regarded as bank 2.ĭetermining the numerical order of these engine banks is reliant upon a knowledge of where an engine’s #1 cylinder is located. The first of which relates to the engine bank that an O2 sensor corresponds with. There are two specific designations used when outlining the location of a particular oxygen sensor. ![]() How to Locate an O2 Sensor Via OBD2 Scan Tool.Can There Be More Than Two Oxygen Sensors Per Side?. ![]()
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