![]() ![]() ![]() You will find it on the exhaust side, closest to the bank 1 cylinder head. On all cars, bank 1 sensor 1 is an upstream oxygen sensor. This is important data that helps ECU when adjusting the air-fuel mixture for optimum efficiency. The task of this sensor is to measure the composition of raw exhaust fumes. This is oxygen or O2 sensors located between the bank 1 cylinder head and corresponding catalytic converter. On V-shaped engines, it is necessary to determine which is bank 1. This will be the only upstream sensor on in-line engines. Regardless of the make and model, bank 1 sensor 1 is located between the engine and catalytic converter. Bank 1 refers to the side of the engine where the #1 cylinder is located. Look under the spark plug firing order section. The best way to determine which side is Bank 1 or Bank 2 is to look it up in your owner's manual. The truth is that Bank 1 sensor 1 can be on either side of the engine. PATHFINDER BANK DRIVERMany car manufacturers assign the passenger side of the engine as Bank 1 and the driver side as Bank 2, which is often the case in most European vehicles. On a six, eight, ten, or twelve-cylinder engine, it gets tricky to determine which one is Bank 1 sensor 1 because those cars typically have two upstream sensors. Mitsubishi Bank 1 Sensor 1 O2 Location Hyundai Elantra Bank 1 Sensor 1 Location ![]()
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