DTC P0491 Audi
Secondary Air System Insufficient Flow. flow check during cat. heating. PZEV only
Secondary Air System Insufficient Flow. flow check during cat. heating. PZEV only
Description
mass air flow, 7.. .150kg h Delta engine load, -10.. .10% rev ECT, 5.. .60° C IAT, 5.. .40° C altitude, <2700 m SAI pressure sensor, ready no fault.
Cause and Solution
Check for signal, voltage and ground
Check harness for open or short
Check connector for damage.
Video Guide
Diagnostic Info
- DTC Code: P0491
- Brand: Audi