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P048C & P0401

224 Views 0 Replies 1 Participant Last post by  Toddski
I'm trying to diagnose my 2012 Jetta TDI with P048C and P0401 codes. Should the exhaust pressure valve move to a closed position on cold startup? I can hear it humming, but it doesn't move. I've taken it apart and lubricated it. It moves pretty easily, but with some resistance in my hand. I don't know if the motor doesn't have enough power to move it, or if the motor is defective.
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