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P0403

Hi there. The code p0403 (https://www.yourmechanic.com/article/p0403-obd-ii-trouble-code-exhaust-gas-recirculation-circuit-malfunction-by-jay-safford) is for the EGR circuit that shows it has malfunctioned. The code p0430 (https://www.yourmechanic.com/article/p0430-obd-ii-trouble-code-catalyst-system-efficiency-below-threshold-bank-2-by-spencer-clayton) is for the catalytic converter showing that its below threshold. Check the harness to the EGR and make sure that...

Hello. Code P0403 is the trouble code for an issue with the vehicle's EGR circuit. The EGR, short for exhaust gas re circulation, circuit is an emissions system that is responsible for recirculating exhaust gases in order to reduce N0x...

Hi and thanks for contacting YourMechanic. The EGR can cause a misfire if it is stuck open when the engine is cold or running at a lower speed. The EGR replaces some of the air with burnt fuel to help...