- On the back of the engine, behind the intake manifold.
There are a total of 4 oxygen sensors on the BMW 328i:
- Bank 2 Sensor 1: Located on the back of the engine, behind the intake manifold.
- Bank 2 Sensor 2: Located on the bottom of the engine, behind the catalytic converter.
- Bank 1 Sensor 1: Located on the front of the engine, on the exhaust manifold.
- Bank 1 Sensor 2: Located on the bottom of the engine, behind the catalytic converter.
