Car Scanner ELM OBD2
DTC report
Selected brand: Honda
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P0420
Raw code: 0420
ECU: 10
Status: Confirmed
OBDII: Catalytic converter system, bank 1 - efficiency below threshold
Honda: Catalyst System Efficiency Below Threshold
Since the CAT was replaced: The warning light comes on each time I drive on the highway but not on side roads. I reset it each time. It doesn't go out by itself.
I'm in Greece and my Greek isn't fluent. The Honda mechanic said something that translates as "scoring". The sensor is very close to the chassis.
Suggestions appreciated!