Q: witch o2 senser is bank 1 the one closest to the motor or the on e at the cat on 2005 Mazda RX-8

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the code that came up saID O2 SENSER BANK 1
(1) Answer
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Hello yes the one closest to the engine is bank 1 sensor 1 you might want to make sure the oxygen sensor is the problem and not a vac.leak.HAVE A BLESS DAY from DR. RECO.