Difference between revisions of "P0491"
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==== Special Notes ==== | ==== Special Notes ==== | ||
| − | * When found in | + | * When found in most '''NAR''' (North American Market) 2009 to 2016 Audi models with 3.0L or 3.2L engines with [[P0491]] and [[P0492]] stored at same time, check to see if TPI '''2033001''' is applicable. |
| − | + | ** https://static.nhtsa.gov/odi/tsbs/2018/MC-10153120-9999.pdf NHTSA | |
| − | + | *** 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 | + | *** 2009-2011 A6 CCAA 3.0L |
| − | ** 2009+ A6 | + | *** 2012 A6/A7 CGXB 3.0L |
| − | ** 2009+ Q5 CALB 3.2L | + | *** 2013+A6/A7 CTUA 3.0L |
| − | ** 2011+ Q7 CJWE, CJWC, CJWB 3.0L | + | *** 2009+ Q5 CALB 3.2L |
| − | + | *** 2011+ Q7 CJWE, CJWC, CJWB 3.0L | |
| + | * When [[P0491]] or [[P2440]] are found in '''NAR''' (North American Market) 2013 to 2015 VW Jetta, Beetle and NMS Passat with 1.8T Engine codes CPPA, CPLA, CPKA and CPRA, check to see if TPI '''2040822''' / TSB '''01-15-14''' is applicable. | ||
| + | ** https://static.nhtsa.gov/odi/tsbs/2015/MC-10122989-9999.pdf NHTSA | ||
[[Category:Fault Codes]] | [[Category:Fault Codes]] | ||
Latest revision as of 09:52, 16 March 2022
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 most NAR (North American Market) 2009 to 2016 Audi models with 3.0L or 3.2L engines with P0491 and P0492 stored at same time, check to see if TPI 2033001 is applicable.
- https://static.nhtsa.gov/odi/tsbs/2018/MC-10153120-9999.pdf NHTSA
- 2010+ S4 and S5 with CCBA 3.0L
- 2008+ A5, 2009+ A4, 2011 A6 with CALA 3.2L
- 2009-2011 A6 CCAA 3.0L
- 2012 A6/A7 CGXB 3.0L
- 2013+A6/A7 CTUA 3.0L
- 2009+ Q5 CALB 3.2L
- 2011+ Q7 CJWE, CJWC, CJWB 3.0L
- https://static.nhtsa.gov/odi/tsbs/2018/MC-10153120-9999.pdf NHTSA