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2014 Passat CC
CEL on with above code.
Replaced downstream sensor ("S2"). Codes comes right back.
With engine running, tried to measure voltage on the 2 white wires on the car plug (the others are grey and black), IIRC those are the heater. No voltage.

Could NOT find a fuse for the heater circuit. Where is it located (ruling out busted fuse)?

What else can I do troubleshoot?
 
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