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On my 2003 3.0l Chrysler Sebring coupe the B1S2 position is the lower O2 sensor on the exhaust against the firewall. B1 is bank 1, which is against the firewall, B2 is bank 2, which is closest to the radiator. S1 is right off of the exhaust manifold and S2 is at the bottom past the last converter on both sides. B2S2 is bottom side closest to radiator etc...

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13y ago

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