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Cmanspeak 3/16/2010
2001 Mazda MPV DX 6 Cyl 2.5L - Engine
Where is the "Bank 2 Sensor 1" oxygen sensor located?
I read the trouble code and it states "Bank 2 Sensor 1 htr low", which most likely means the oxygen sensor is bad. I am trying to figure out where it is located, Bank 2 is one side or the other of the engine referring to the bank of cylinders. I don't know which side is bank 2. Sensor 1 is referring to the oxygen sensor on bank 2 BEFORE the catalytic converter, which again once I know which side is bank 2 I should find the oxygen sensor on the exhaust manifold of that side before the catalytic converter.
3 Answers
  • Bobby
    Bobby 3/16/2010
    Manufacturers us different numbers. Its a toss up you can either try and change the easier of the two and hope thats it or try searching online and maybe finding out how mazda label bank 1 bank two. Usually bank 1 is the side with cylinder 1. So if you know your firing order i would find cylinder one and try the O2 on the opposite side of that first.
  • HouseCallAuto
    HouseCallAuto 3/16/2010
    Bank two is the front of the engine closest to you on your vehicle. The sensor that you want to change (Bank 2 sensor 1) is located at the top right side of the front exhaust manifold. You will see another sensor below that on - that is Bank 2 sesor 2 (after the catalyst)

    Kevin - HouseCall Auto Mechanics
  • Cmanspeak
    Cmanspeak 3/17/2010
    Thank you Kevin of HouseCall Auto Mechanics. I did find the two O2 sensors one high on the front Exhaust manifold and one lower. I will unplug one at a time and read the OBDII to make sure I unplugged the correct sensor that most likely needs to be replaced.
    Thanks again.

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