Does the Alsvin throw a check engine light CEL o r specific error codes like P0420 when the catalytic converter malfunctions?

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Does the Alsvin throw a check engine light CEL o r specific error codes like P0420 when the catalytic converter malfunctions?

Are owners aware of these codes and their meanings?

Lubaba asked on 11 Jun 2025 18:15:02 pm

1 Answer

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Car Mechanic Expert - on 11 Jun 2025 18:19:11 pm

Yes, it does. Common error codes include:

P0420 – Low Catalyst Efficiency.

P0430 – If dual-bank system.

P0171/P0172 – System too lean/rich linked with airflow o r cat issues.
The CEL usually appears after sustained underperformance, and many users ignore it o r reset it without fixing the root cause.