P0491

2A00 - P0491

Information saved in
DME

Fault code
2A00 - P0491

Fault text
Secondary-air system

Fault description
Secondary Air Injection System Insufficient Flow (Bank 1)

Condition for fault identification
Test condition:
Activation conditions:
- Engine start
- Secondary air-injection must be active
- Ambient temperature >3 °C
-3.8 °C < Coolant temperature < 50.3 °C
Terminal condition: Terminal 15, engine start
Voltage condition:
Vehicle electrical system voltage (battery voltage between 7
& 15 V)

Condition for fault memory entry
40 sec.

Action in service
1. Remove secondary air-injection valve and clean the
passage to Bank 1 (in engine block)
2. Install valve again and run through EOL test. If the
malfunction is registered again, repeat steps 1 and 2.

Fault effect and breakdown warning


Driver information
Warning light:
MIL

Service instruction
none