The oxygen sensor screws into the front exhaust manifold. Look straight down and you'll see it. It looks like a spark plug with a thin wire trailing from it.
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In the 1989 Grand Prix, the oxygen sensor is in the tail pipe. Look for a wire that is plugged into both the tail pipe and the undercarriage of the vehicle.
show location
The 1991 Pontiac Grand Prix oxygen sensor is located on the outside of the air filter housing. You will find the sensor on the back side of the air filter housing.
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replacing a fuel sensor on a 2003 grand prix?
its should be located on the top of the oil pan.
It"s located on the rear manifold, between the firewall and the engine for the upper oxygen sensor(b1s1), and between the catalyst converter and the resonator for the second oxygen sensor (b1s2), between the pipe and the floor.
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The O2 sensor is right off of the rear exhaust manifold, right of the transmission fluid dipstick.