We have a 2011 Sienna (~74K miles on it). We bought it as a toyota certified used car about 4 yrs back with 40K miles on it & bought platinum warranty until 100K miles.
A little over a month back, the check engine & VSC lights came on in my Sienna. So, I took it to the dealer to get it checked. The dealer had to take the whole engine apart just to diagnose what happened. Finally, they came back and told us that a small porcelain part of the spark plug in cylinder 5 chipped off & fell into the cylinder, and over time it has scored the walls of the cylinder causing the cylinder to loose compression. To fix it, the dealer says they’ll have to replace the short block in the engine, and it’s going to cost me around $8000. The extended warranty says that spark plugs are not covered, so they are not going to cover the cost of the repair. The car has now been sitting with the dealer for more than a month & I have still not been able to convince them or toyota corporate to pay for the repairs. Very frustrated now!
My question is: does this actually happen? Is it even possible for the porcelain to chip off from the spark plug & fall into the cylinder? What are my options?