Powertrain
generic / SAE
P25F6
AIR System B
A general fault in the second secondary air injection (AIR) circuit. Detected by the O2 sensors which expect a lean swing during cold-start AIR pump operation but do not see one.
SystemPowertrain
Typegeneric / SAE
GroupP2
Range / number5 / F6
Possible causes
- Failed AIR pump motor or impeller high
- Check valve seized by exhaust soot medium
- Corroded or cracked air injection pipe medium
Inspection / repair
- Difficulty: hard
- DIY: shop recommended
- Estimated cost: 200–1500 €
- Estimated time: 1.5–5 h
- Component: air pump b
- Component: air check valve
- Component: air pipes
- MIL / check engine light
- emissions-relevant
Sources
References
sae:J2012