Re: 1999 a6 p0432 p0411

P0411 - Secondary Air Injection System: Incorrect Flow Detected Possible Condition: Malfunction Indicator Light (MIL) ON
Possible Cause: Fuel Pump
Relay (J17) faulty Hoses/Pipes to/between Components faulty/clogged Secondary Air Injection Pump (V101) faulty Secondary Air Injection Pump Relay (J299) faulty Secondary Air Injection Solenoid Valve (N112) faulty Diverter Valves stuck in open or closed position Connection to diverter valves faulty
Possible Correction: Check Fuel Pump Relay (J17) Check Hoses/Pipes to/between Components Check Secondary Air Injection Hoses/Pipes for Carbonization Check Secondary Air Injection Pump (V101) Check Secondary Air Injection Pump Relay (J299) Check Secondary Air Injection Solenoid Valve (N112) Remove and test diverter valves Run the readiness code as a final test
P0432- Main Catalyst, Bank2 Efficiency Below Threshold Possible Condition: Malfunction Indicator Light (MIL) ON
Possible Cause: Defective Cat, non OEM CAT, Defective O2S Check HO2S -G108- and O2S control (bank 2, sensor 1) Possible Correction: Measure and test all O2 sensors - Fore and Aft Test the CAT temperatures with a laser Run the readiness code as a final test
(using the carb and choke cleaner) - not a good test! Use a smoke machine.
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Ecmbuster
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