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What is a B1S1 oxygen sensor?

Updated: 12/13/2022
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12y ago

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Bank 1 is the passenger side of the engine in a Mercury Grand Marquis

Sensor 1 would be in the exhaust close to the engine before the exhaust enters the catalytic converter ( upstream sensor )

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12y ago
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3y ago

can this cause truck not to start

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Q: What is a B1S1 oxygen sensor?
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