ME9 / P0420 00
Read the instructions below then
start the fault diagnostic procedure.
Symptom: Malfunction Indicator Lamp
Three Way Catalytic Converter. Malfunction.
Fault symptom
Malfunction Indicator Lamp
On-board diagnosis
Type of diagnosis:
Enable criteria:
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:
(See also description of readings/activations in diagnostic tool) |