P0492
P0492Diagnosis information - Control unit DME (DFI)
Secondary air system Bank 2
Diagnostic conditions
- Short test perform
or:
- Diagnosis starts under the following conditions::
- Engine running
at:
- Ambient temperature more than 5 °C (°F)
- Engine start temperature 5 ... 32 °C (°F)
- Secondary air injection Active
- none of the following faults stored: Oxygen sensor in front of catalytic converter, Coolant temperature sensor Engine, Camshaft adjustment, Ambient pressure, Ambient temperature
- Diagnosis ends under the following conditions:
- Oxygen sensor in front of catalytic converter not ready for operation
- Period of time total (Diagnosis) exceeded (depending on: Engine start temperature)
- Diagnosis will be interrupted for as long as the following conditions exist::
- Engine speed more than 3,500 1/min
- Mass air flow more than 750 mg/stroke
- Overrun phase(s)
Possible fault causes
- Catalytic converter Faulty (broken)
- Lead Secondary air injection leaks
- Secondary air valve Bank 2
- Secondary air valve Bank 1 stuck / frozen
- Air-inlet duct (Engine) Narrowed /fouled
- Fuel/air mixture preparation not adapted
Fault setting condition(s)
- Deviation Lambda control Actual value less than/more than Nominal value
- The diagnosis checks whether deviation of the oxygen sensors is as expected upon activation.