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jose martinez

P1135

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Bank 1 sensor 1 is between the radiator and engine.. Bank 2 sensor 1 is between the firewall and the engine (back side of engine).

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Bank 1 is against the firewall. Some of the diagrams at the auto parts stores show it as the front bank, but they are incorrect.

This page is from the Lexus factory service manual. My Haynes manual also agrees with bank 1 as the rear.

Emission Control System.pdf

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