If the MIL illuminates, it's likely that the engine is running in open loop, based on programming and not feedback. Address the check engine light promptly.If you or your technician see anything that needs care, address it right away to prevent possible damage to the catalytic converter. Keep up with regularly scheduled maintenance, like oil changes, air filter changes, and regular inspections. To reach proper operating temperature, spend at least 20 minutes driving at highway speeds once a week. Don't let your car sit for weeks without being driven, and make sure you take a few long drives rather than only short trips. If you have to replace your catalytic converter, make sure it lasts as long as possible with these tips. Sometimes, the catalytic converter absolutely needs to be replaced (like if it's broken internally or melted down). Make Your Catalytic Converter Last Longer If the engine control module (ECM) detects a catalytic converter problem, it might record DTC P0420, defined as “Catalyst System Efficiency Below Threshold.” An illuminated check engine light or malfunction indicator lamp (CEL or MIL) with a catalytic converter diagnostic trouble code (DTC) is the most common catalytic converter problem indicator.
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