Update 2021: 2.5 years and 30k miles later, 3 of 4 coils I installed are still working. It seems like few of them are bugs, and when they fail, they do so fairly quickly, as per my original review below. The seller after the post below immediately offered to replace the dead one with a new one after 3 months, but that is not necessary as I have 2 left out of 6 packs. I would recommend only using in easily accessible front cylinders. ***** Genuine 2007 Toyota Sienna coil packs started failing at 167,000 miles with the front 2 cylinders at weekly intervals. Bought 6 packs of ignition coils and new spark plugs. 2 front spark plugs and coils replaced. 3K miles or less and more than 3 months later one of them died. A few days later one of the horrible rear solenoids died. (6 hour job replacing 3 rear spark plugs and coils) Bought 3 sets of Denso OEM coils for the rear wheels (each cost almost the same as these 6 sets). Hopefully they last 150,000+ like the factory as changing the rear spark plugs and coils on the Sienna was a job I hope to never do again. I will be using leftover new AA ignition coil packs for the front (5 minute job to replace if they die). Incidentally, the iridium candles used by Toyota still had a gap in the factory specifications after 270,000 km and looked great.
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