Emissions and catalytic converter codes
Catalytic converter, EGR and secondary air codes. 14 codes, each with symptoms, causes, diagnosis steps and repair cost estimates.
P0400Exhaust Gas Recirculation FlowP0401Exhaust Gas Recirculation Flow Insufficient DetectedP0402Exhaust Gas Recirculation Flow Excessive DetectedP0403Exhaust Gas Recirculation "A" Control CircuitP0404Exhaust Gas Recirculation "A" Control Circuit Range/PerformanceP0405Exhaust Gas Recirculation Sensor "A" Circuit LowP0406Exhaust Gas Recirculation Sensor "A" Circuit HighP0410Secondary Air Injection SystemP0411Secondary Air Injection System Incorrect Flow DetectedP0412Secondary Air Injection System Switching Valve "A" CircuitP0420Catalyst System Efficiency Below Threshold (Bank 1)P0421Warm Up Catalyst Efficiency Below Threshold (Bank 1)P0430Catalyst System Efficiency Below Threshold (Bank 2)P0431Warm Up Catalyst Efficiency Below Threshold (Bank 2)