P0416

P041600

Diagnosis information DME control unit

Secondary air system

DANGER
High voltage.
Death or severe injuries due to high voltage or high current.

- De-energise the vehicle in accordance with the guidelines.
- Work must not be performed on parts carrying a high voltage.

Diagnostic conditions
The control unit must be active in order to test internal function sequences and diagnosable inputs/outputs.
In the event of a fault, check whether the fault is permanently >present<. To perform the check, erase the fault memory, meet the diagnostic conditions and read out the fault memory again.
- Short test perform

Possible fault causes
- Lead Secondary air injection leaks
- Secondary air valve stuck / frozen
- Air-inlet duct (Engine) Narrowed / fouled
- Fuel/air mixture preparation not adapted

Fault setting condition(s)
- Deviation Lambda control Actual value [] Nominal value