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2001 Mazda MPV that has the bank one sensor one O2 sensor gone bad How do you know which sensor this is and where it is located?
Jimbobiii
Typically Bank 1 Sensor 1 refers to the same bank that cylinder 1 is on. Being that there is 3 o2 sensors on this vehicle,1 sensor is always before the cataletic converter. Bank 1 sensor 1 should be located to the front of the vehicle. Dude, I just changed this same sensor on a 2000 model so unless the model changed a ton from the following year this should help you. You need to get underneath the car. Because the engine is turned sideways the first sensor on Bank 1 is near closer to the driver than the front of the vehicle. Just follow the tailpipe up to the engine. The first one goes up and it's in a tight position, but do what you can to get to it. Lot's of WD-40. good luck. There are 4 of them on this car. Bank one sensor one is the one in the manifold(upstream of the cat for that side) on the rear side of the engine. It's technically the right side since as mentioned the engine is sideways. Of the 4 it's the hardest to get at. It's always th eone whos heater fails because its location has the worst conditions. I paid $40 to have it changed. And make sure you have the right heatewr wattage or the check engine light will stay on although this won't hurt anything. Using the factory part rather than aftermarket is the safe way to ensure this.
Wiki User
∙ 15y ago
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