S3 - P0118 - Engine coolant temperature circuit

Greig300

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Driving to work 2 days ago noticed the check engine light on. Fans on max when car was turned off for a few minutes. Had the car scanned for faults. Now with codes cleared. No warning lights and it seems perfect again. After doing some reading up i see its just a little ECT sensor? If so i'd ideally like to replace this wondering if anyone knew where to buy?

P0118 - Engine coolant temperature circuit.