Question about 2001 Mazda MPV

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The dealer says I need O2 sensors in position Bank 1 and Bank 2. There are four sensors so which is Bank 1 and 2?

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Yes there are 4 sensors, one on each bank of your V6 above the catalytic converter and also a pair below the cats, maybe you should find an independent garage to put the Mazda on their code reader and find out the whole picture, my reader cost $300 and is low end but gives all the info on each O2 sensor (and all other sensors) in real time so I can see how many are going off spec and need changing. Dealerships work to manufacturers reccomendations and guidelines so probably have to change the pair.

Posted on May 02, 2010

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Which sensor is the bank 2 sensor 1 for a 2001 nissan sentra?


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The bank refers to which side of the engine. a four cylinder only has one bank so there can only be a bank 1. A v-6 or v-8 will have two banks since there is a bank of cylinders on each side of the engine. So there will be a bank 1 which is always the same side of the engine as the number one cylinder, and a bank 2 which is always the other side of the engine.

Sensor refers to upstream or downstream of the catalytic converter. Sensor one is upstream or before the cat. Sensor 2 is downstream or after the cat.

If you entered the wrong year or wrong vehicle or if you can post the actual code I will see if I can help you further.

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