Question about 2006 Buick LaCrosse
Engine light on
Posted by Anonymous on
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Posted on Jan 02, 2017
the convertor is located under the car its part of the exhaust system you will see the 02 sensor sticking out of the exhaust pipe
Posted on Feb 09, 2011
Just because you have a check light on & a code,does not mean
the O2 Sensor is bad.
Bank #1 is always on the side that cylinder #1 is on
Sensor #1 is closest to the engine before in in the converter
Sensor #2 is the Rear,Downstream or Monitor Sensor
usually in the converter outlet
Just want you to be aware that when you replace it you may still have
the same check light & code & then mabe you wil get lucky
That way of doing things will only work a couple of times
Most GM motors, the #1cyl would be on the motors left side
On a Ford, the front right side
If you have single exhaust it is easy & you may as well do both
The upstream or front one gets done every 80 to 100,000 miles
The rear ones SELDOM FAIL that is why I'am explaining all this
Posted on Sep 23, 2011
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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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