When the diagnostic tools refer error to Bank 1 Sensor 1(for example).Then, which sensor should i check?
As a general rule, the leading cylinder (cylinder 1)is the designator of Bank 1.And some pictures will make it more clear.
I will make a short description with example. For our most popular oxygen sensors recently. Part #234-4012 & 234-4018,fit 1996-2002 Chevrolet GMC Silverado 1500 Express 1500.Which has a V6/8 Type Dual exhaust system, longitudinal engine. When the tool refer to the Bank 1 error. You need to check both upstream and downstream at the right engine block. And remember sensor 2 means the downstream, always behind the catalytic converter.
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