Exhaust Gas Sensor Connector Replacement for Catalytic Converter The connector is 100 * Function of the connector: It reduces the reading of sensor #2 to the normal rate as if the catalytic converter is present, and the catalytic converter error codes disappear. - First code: P0420 Catalyst Bank1 Catalytic converter exhaust #1 - Second code: P0430 Catalyst Bank2 Catalytic converter exhaust #2 The connector hides only codes P0420 and P0430 and resolves the faults for these two codes. The connector fits all cars. Installation is very easy in any workshop. 4-cylinder cars need one connector. 6 and 8-cylinder cars need two connectors.