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ME9 / P0420 00

Read the instructions below then start the fault diagnostic procedure.

Symptom: Malfunction Indicator Lamp

  P0420 00


Three Way Catalytic Converter. Malfunction.

Fault symptom

Malfunction Indicator Lamp

On-board diagnosis

Type of diagnosis:

Once per driving cycle.

Enable criteria:

Air mass 5 - 16 g/s.
Start temperature above -30°C.
Engine running more than 5 minutes.
Calculated exhaust temperature between 500°C and 750°C.
The above conditions must be fulfilled for 17 minutes.
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Closed loop delayed in rich mode until O2S2 shows rich.
Closed loop delayed in lean mode and time is measured until O2S2 shows lean.

Fault criteria:

Too short time to O2S2 shows lean, indicating that the catalytic converter's oxygen storing ability is poor.

Diagnostic help

Diagnosis regards:

Faulty catalytic converter.

Functions in the diagnostic tool related to the fault:

Test value:
O2S1 lambda
O2S 2

(See also description of readings/activations in diagnostic tool)