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Low input engine temp sensor on 2003 Volkswagen Jetta

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I have a P0117 fault code low input engine temp sensor needing to be changed. Where is it? Have a engine indicator light on dash ( not flashing). Engine has 82K on it. Help?
(2) Answers
this fault does not mean a sensor. you need a real diag, not a free code pull from a parts person. it may be as simple as a thermostat.

Roy