Bad coils in 2007 Lexus RX 350

I have 2007 Lexus RX350 V6. All the coils were replaced by brand new coils by dealer. After 1-2 months the coil went bad again. Dealer want to charge $800 to take apart the engine to diagnose. I have already spent almost $4000 for this coil problem in the last few years because the coil (again, bought from dealer) failed over and over again. What should I do?

Coil failures on 2007 ES and RX vehicles are common. Replacement parts and repairs should come with a 12 month/12,000 mile warranty, why should you pay for the same repair over and over again?

If the dealer wants to charge a diagnostic fee to find the problem it must not be a P035X fault, are you sure that there is a coil problem?