Question about 1997 Chevrolet Lumina
Upstream o2 sensor on 3.1 chevy lumina
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Posted on Jan 02, 2017
It's held down by one bolt right above the timing chain cover. It's next to the head that's facing toward the front of the car.
Posted on Feb 06, 2009
Hi the oxygen sensor is located in the exhaust it will either be just before or just after the catalytic converter it will be bolted into the exhaust and will have two wires coming off it that connect into the wiring loom near the engine.
Posted on Mar 26, 2010
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Fig. Fig. 3: Oxygen sensor-4.3L engines
Fig. Fig. 4: Oxygen sensor-5.0L and 5.7L engines
Fig. Fig. 5: Oxygen sensor-7.4L engines
Oxygen sensors are always numbered like this:
Bank 1 sensor 1
Bank 2 sensor 1
Bank 1 sensor 2
Bank 2 sensor 2
Some manufacturers use a kind of shorthand that reads different, but means the same thing:
Sensor 1/1 or O2s 1/1
Sensor 2/1 or O2s 2/1
Sensor 1/2 or O2s 1/2
Sensor 2/2 or O2s 2/2
Bank 1 is always the side of the engine where cylinder number 1 is located and, of coarse, Bank 2 is the opposite side.
On a 4 cylinder engine, there is only 1 bank and it is always referred to as Bank 1.
Sensor 1 is always the upstream sensor (the one located BEFORE the catalytic converter)
Sensor 2 is always the downstream sensor (the one that is located AFTER the catalytic converter.
Hope helps (remember to rate this).
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