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Jul 13, 2009 · SES light is on but I believe its unrealted as its showing a code for an o2 sensor p0430 (which I've been fighting an ongoing war with). I believe there was a valve clearance code a month ago but the dealer said that it was probably just low oil (right after I bought it), and it doesn't seem to be showing up now. P0440 - Evaporative Emission (EVAP) System - 5.5%. P0141 - Oxygen Sensor Heater (H02S) Performance Bank 1 Sensor 2 - 5.1%. P0430 - Catalyst System Low Efficiency Bank 2 - 3.2%.P0171 Meaning With the Air/Fuel Mixture Ratio Self-Learning Control, the actual mixture ratio can be brought closely to the theoretical mixture ratio based on the mixture ratio feedback signal from the heated oxygen sensors 1. Aug 16, 2020 · As the code description implies the P0430 code means that the vehicle's control module has detected that the three-way catalytic converter is not working properly (is not as efficient as the factory is expecting).