How To Determine Oxygen Sensor Location?
Jason’s question:
I’ve got a bad oxygen sensor on my 2002 ML 500. The code said bank 1, sensor one. I see four sensors on the car. Which one is this?
Answer:
Bank one sensor one is the oxygen sensor on the driver’s side exhaust, just past the exhaust manifold. For all those out there, bank one is always the bank where the number one cylinder of the engine is. Using any other terminology just confuses things, like left side or right side (since this really depends upon where you are– sitting inside the car or standing in front of the hood.) And number one sensor is always the sensor before the catalytic converter, with number two being the sensor after the catalytic converter.
