- Electrical fault in secondary air injection pump
- Mechanical fault in secondary air injection pump or secondary air injection pump blocked
- Vacuum system leaking
- Air hose to secondary air injection pump slipped off or constricted
Affected terminals
- Secondary air injection pump relay pin 5 to secondary air injection pump pin 1
- Power supply for secondary air injection pump relay pin 3
- Ground supply line for secondary air injection pump pin 2
Diagnosis/troubleshooting
NOTE:
- The secondary air volume is measured using the oxygen sensors. This is done by recording the oxygen injected into the exhaust gas via the
secondary air injection pumps and comparing the recorded value to a limit value.
- Secondary air diagnosis can be activated with the Porsche System Tester 2 in the "Short test" menu.