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This is an oxygen sensor emulator used when the catalytic converter is damaged and is needed to remove it. This action caused error code P0420 (Catalyst system efficiency below threshold Bank 1) or P0430 (for vehicles with Bank 2) and the check engine light is constantly on.
This Emulator will tell the ECU that the downstream oxygen sensor is working correctly. With the universal kit you will need to know how to use a basic multimeter for installation. There are a wiring diagram in the description.

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