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Which sensor is which?

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Chrysler 300M How can we tell which one is which?

Vehicle: 2004 Chrysler 300M

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Oxygen sensor go by upstream sensor and downstream sensor, Bank 1 is always where the number 1 cylinder is located at, Bank 2 is opposite of where cylinder 1 is located. Sensor 1 are the upstream 02 sensor or the engine management sensors.  Sensor 2 are catalytic monitor sensor or the downstream 02 .

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