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there are 2 pre and two after
4
Theres four o2 sensors in this particular bmw. Two before and two after the cat converters.
4. 2 pre cat, 2 post.
A 2001 BMW 325i has two coolant temperature sensors. They constantly monitor the temperature and adjust flow as needed.
Some 323 bmw's in the E36 platform only have 2 O2 Sensors, 1 pre cat and 1 post cat, unlike other BMW's that actually have 2 on the exhaust manifolds (1 per manifold) and two sensors at the cat for a total of 4 sensors. This might be a bit confusing but BMW went with a simpler design on the 323 E36 I don't know why.
On the exhaust pipe 1 before the cat and 1 after
how do you replace oxygen sensor of 2001 bmw 318 ci es
The O2 sensor is in the exhaust pipe before the catalytic converter.
The rear oxygen sensors are located after the catalytic converter's Usually under the vehicles floorboard.
Many ppl might say 4 but in reality there are only 2 and it's about $100 a piece if u want to replace them.
also, are any special tools required?