Cannot start car when engine is still warm on Audi A6

Average mileage: 63,000 (56,000–70,000)
1 model year affected: 2001
2 people reported this problem
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2001 Audi A6 70,000 mi,
When try to re-start engine when the engine is above 200F, it cannot be started. You have to wait till engine cools down under 200F to start it again. The problem is the bad coolant sensor, can be replaced easily.