Powertrain
generic / SAE
P2443
Secondary Air Injection System Switching Valve Stuck Closed (Bank 2)
The switching valve on bank 2 will not open when commanded, so no secondary air reaches the exhaust during cold start. Catalyst light-off is delayed and emissions during the cold-start window rise.
SystemPowertrain
Typegeneric / SAE
GroupP2
Range / number4 / 43
Possible causes
- Switching valve stuck closed high
- Carbon or debris buildup preventing free movement low
- Component wear with age - mechanical play low
Inspection / repair
- Difficulty: medium
- DIY: possible
- Estimated cost: 80–600 €
- Estimated time: 0.5–2.5 h
- Component: secondary air switching valve
- Component: secondary air vacuum lines
- MIL / check engine light
- emissions-relevant
- drive cycle required
Sources
References
sae:J2012