Question about 2000 Buick Century

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Need to know were the bank one , sencer one is on my buick century 2000 v6

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  • Buick Master
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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).

Posted on Oct 07, 2010

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  • Buick Master
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Bank one is always on the same side of the engine as the number one cylinder. In your case the backside near the firewall. Bank 2 is the other side.

Sensor one always refer to the sensor before the catalytic converter. Sensor 2 is always after the catalytic converter.

So Bank 1 Sensor 1 will be in the exhaust manifold on the back side of the engine (firewall side) and before the catalytic converter. I should be mounted in the exhaust manifold dead center

Posted on Oct 07, 2010

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Posted on Jan 02, 2017

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