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Car Computers and Sensors
Pontiac Bonneville
Grand Am SE

How do you know which oxygen sensor on 2001 Pontiac grand prix is bad?

Answer

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Wiki User
January 20, 2008 3:18AM

Bank 1 is usually the bank that #1 cylinder is on (sometimes the driver side while bank 2 is the passenger side) and sensor 1 is before the cat converter while sensor 2 is after the converter.