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06 Jetta TDI. Check Engine idiot light came on.

Diagnosis: there was a code for intake manifold flap position sensor-implausible signal. This sensor controls and is integrated into the intake shut off valve. The wiring and connector for the valve look intact and the valve does work properly so there is an issue with the sensor. Parts and labor were about $500.

I declined the repair. Light went out all by itself and stayed off for about 10 days, then returned.

Question--what kind of damage could I do if I just ignored the problem? PS--the whole electrical system on this car is quirky so I can't even be sure there really IS a problem.

Thanks for any help/input.
 
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