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Q:

where is bank 1 sensor 1? on 1999 Nissan Frontier

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
JUST NEED TO KNOW LOCATION
(1) Answer
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I believe it is on the RH side of the engine, sitting in the truck. The one closest to the engine exhaust manifold.