Where is bank 1 sensor 1 located and bank 2 sensor 1


Asked by Dionp973 Apr 02, 2013 at 08:04 PM about the 2001 BMW X5 3.0i

Question type: Maintenance & Repair

Looking for the o2 sensor location

5 Answers


Its the first sensor in both exhaust pipes. Find where the exhaust manifold connect to the motor and follow it the sensor before the catalytic converters are sensor one on both banks

4 out of 4 people think this is helpful.

follow exhaust from one side of engine manifold at engine to the first wired in o2 sensor then do the same on other side.same way. bank one left side bank two right side engine

1 out of 1 people think this is helpful.

Bank 1 is your upstream O2 sensor. Usually located in the exhaust manifold. This sensor monitors exhaust gases & tells the computer what's coming out of the engine. The computer uses that information to make constant adjustments to maintain the proper air/fuel mixture for optimum performance & emission control under all driving conditions. Bank 2 O2 sensor is located in the exhaust pipe just after the catalytic converter. Also called the downstream O2 sensor its job is to monitor the catalytic converter. If your computer tests the catalytic converter & it fails it is the downstream O2 sensor that picks up on it & sets a trouble code to alert you the catalytic converter is bad. HTH. -Jim

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Youssef Nassar

The prices of both sensor bank1&2

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Mickey West

Js08016 The Bank refers to the side of the motor. Bank 1 is the side that cylinder number one is on and Bank 2 is the other. Sensor 1 is the upstream sensor and sensor 2 is the downstream sensor after the catalytic converter.

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