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A compression test needs to be done on a warm engine. If you run one on a cold engine that would not start, you should add a tbsp of oil to each cylinder. If the scan showed a bad ESS, have the mobile mechanic replace it with one from the local parts store. If you have any mechanical skills (oil change type), you can change the sensor yourself on a 1.8T.
 

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Yes, but an engine that does not start for another reason may have washed the oil off of the cylinder walls and shown an artificially low compression reading.
 
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