(VIN: -039999) Trionic T7 V6 OBD II (B308E)

P0420
Three Way Catalytic Converter. Malfunction.

Fault symptoms
- CHECK ENGINE.

On-Board Diagnostics
Type of diagnosis:
- Once per driving cycle. Interrupted when fault criteria fulfilled or OK reported. Restarts next driving cycle.

Enable conditions:
- General conditions for this trouble code: When starting the engine, the atmospheric pressure must exceed 78 kPa and the engine coolant and intake air temperatures must exceed -7°C.
- Igniting the catalyst: Engine running. Air mass flow has exceeded 6 g/s for 120 S accumulated time. Air mass flow has exceeded 24 g/s for 18 S accumulated time. No engine braking with fuel shut-off for longer than 10 S. No idle period longer than 40 S.

Evaluation of catalyst: More than 200 S elapsed since start. Engine coolant temperature above 70°C. Speed 40-115 km/h. Accelerator pedal depressed. Engine speed 1100-2300 rpm. Engine load 90-130 mg/c. Voltage transitions in oxygen sensor 2 corrected with respect to load and engine speed and accumulated during accepted voltage periods for oxygen sensor 1*. When voltage transitions have been corrected and accumulated for 20 S, their mean value will be calculated.

*) Accepted periods have 30-80 % pulse ratio (+trigger).

Fault criteria:
- Mean value of voltage transitions exceeding a calibrated value.

Dependents:
- P0100, P0102, P0103, P0116, P0117, P0118, P0131, P0132, P0134, P0138, P0140, P0336, P0337, P0501, P0502, All throttle faults.

System reaction to a fault:
- None.

OK report:
- Diagnosis performed once and fault criteria not fulfilled.

Fault handling: See "Fault diagnosis, general" for more information.
- Type III.

Diagnostic help
The capacity of the catalyst can be reduced temporarily or permanently for the following reason
- Lead or sulphur in the fuel.
- Fuel additives.
- Engine oil additives.

Functions in the diagnostic tool related to the fault:
- Diagnostic status for the diagnosis.

See also the description of readings in "Fault diagnosis, general" for more information.