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Q: check engine light came on 2 days after service (timing belt water pump replaced on 2004 Volkswagen Passat

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
My son said to remove neg battery wire to reset computer... could be water temp sensor/air in coolant. Light went out. 2 weeks later came on again. Repeated same, light out operation normal. Also since water pump/timing belt was replaced the coolant temp has been running lower by 10-20 degrees.
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