thermostat and sensor issue

Asked by GuruMN9RG May 22, 2020 at 05:02 PM

Question type: Maintenance & Repair

2011 Audi A4, check engine light went on, and diagnostic is thermostat and sensor issue.  car runs fine, not overheating or leaking fluid.  what needs to be replaced

1 Answer
157,705

James answered 4 years ago

Your thermostat may be stuck open and not allowing the engine to reach normal operating temperature. On a computer controlled engine the engine must reach operating temperature within a certain time period from a cold start up. Usually within 10 minutes. If it doesn't the check engine light will come on and a trouble code will be stored for the thermostat. Hope that helps! Jim

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