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Mazda 6 3.0 V6. Cylinders 2 and 4 have no compression and the other four do. What would cause this?

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This could be caused by any number of problems. The most common are probably:

  1. Stuck or burned valves
  2. Blown head gasket
  3. Burned piston
  4. Damaged piston rings and/or cylinder wall

Is there any other history of this vehicle that might give some more clues?

But before you do anything else, please double-check your compression tests. I find it odd that there are two cylinders with ZERO compression.

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