Difference between revisions of "P0491"
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(Created page with "__FORCETOC__ == P0491 - Secondary Air Injection System: Bank 1 == === P0491 - Secondary Air Injection System: Bank 1: Insufficient Flow === ==== Possible Symptoms ==== * Ma...") |
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* When found in the following '''NAR''' (North American Market) Audi models listed below check to see if TPI 2033001 is applicable: | * When found in the following '''NAR''' (North American Market) Audi models listed below check to see if TPI 2033001 is applicable: | ||
| − | *'''Audi''' TPI | + | *'''Audi''' TPI 2033001 pertains to [[P0491]] and [[P0492]] stored at same time on the following vehicles with more than 15,000 miles: |
** 2010+ S4 and S5 with CCBA 3.0L | ** 2010+ S4 and S5 with CCBA 3.0L | ||
** 2008+ A5, 2009+ A4, 2011 A6 with CALA 3.2L | ** 2008+ A5, 2009+ A4, 2011 A6 with CALA 3.2L | ||
Revision as of 16:00, 14 September 2015
P0491 - Secondary Air Injection System: Bank 1
P0491 - Secondary Air Injection System: Bank 1: Insufficient Flow
Possible Symptoms
- Malfunction Indicator Light (MIL) active
Possible Causes
- Fuse or relay for Secondary Air Injection Pump faulty
- Hose(s)/Piping between Secondary Air Injection Pump and Combi (Secondary Air Injection) Valve leaking
- Secondary Air Injection Solenoid(s) faulty
- Secondary Air Injection Pressure Sensor faulty
- Combi Valve(s) faulty
- Secondary Air Injection ports in the cylinder head(s) plugged with carbon See Special Notes
Possible Solutions
- Check fuse and relay for Secondary Air Injection Pump system.
- Check hose(s)/Piping between Secondary Air Injection Pump and Combi Valve
- Check Secondary Air Injection Solenoid(s)
- Check Secondary Air Injection Pressure Sensor
- Check Combi Valve(s)
- Clean Secondary Air Injection ports in the cylinder head(s) if obstructed with carbon See Special Notes
Special Notes
- When found in the following NAR (North American Market) Audi models listed below check to see if TPI 2033001 is applicable: