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Suggestions
Instead of throwing parts at the problem, buy a code reader for $60, read the codes, post them here and someone will give you a list of the probable causes.
Did you buy Porsche or Bosch parts for the 4 sensors or use some other brand? Replace with same part #?
Your mechanic took you...there is very very little chance you needed to replace all 4 sensors and any muffler shop could do one for you for about $50 in labor and a $140 part that was the exactly correct part. Or it is easy to do yourself and there are online instructions. If that was what the code really said.
Now what is this code?
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Threaded Mode
