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GM code P0151 Bank 2 sensor 1

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Front of engine before the CAT right?
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The 2003 Deville ....... Bank 1 is the right (rear) bank. Bank 2 is the left (front) bank.

B2S1 is in the exhaust manifold collector.
B1S1 is on top of the exhaust manifold.
B1S2 is the after-cat sensor.


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