DTC P0421 Audi
Warm Up Catalyst, Bank 1 Efficiency Below Threshold
Warm Up Catalyst, Bank 1 Efficiency Below Threshold
Description
Catalyst temperature- 580 - 780 °C Engine start temperature-> -10 °C Δ Mass air flow - <20kg h Engine speed-1,000 - 2,000 rpm Mass air flow - 40-120kg h Engine load lower limit-18 - 23 % Actual EVAP Purge flow - <30% Δ Cat temp. <20K s
Cause and Solution
Check for signal, voltage and ground
Check harness for open or short and connectors for damage
Video Guide
Diagnostic Info
- DTC Code: P0421
- Brand: Audi