I just had a catastrophic failure in my 2005 Honda Pilot. The check engine light started flashing and the engine was running rough. Felt like a spark plug wasn't firing. Limped it to the shop where the mechanic reported that the spark plug in the number 5 cylinder had disintegrated due to an overhead coil, parts of the plug were in the cylinder, and the threads in the cylinder head had melted. I have never heard of this being possible. Estimated cost between $3000 (head job) and $5500 (new engine). Feedback anyone?