tl;dr: financing regular maintenance parts for any vehicle is a bad idea. Avoid money pits.

Car depreciation is a thing and those prices are insane to finance. It doesn't make sense to buy a part that's worth more than the entire vehicle. This was an issue with Prius's when they first rolled out. When the battery pack died, the car still ran, but it was in the range of 10k to the battery replaced. It did not make sense to replace it on a vehicle that was probably well into 5 or 6 years. You could also sell the Prius because it was still held value as a running vehicle. Thankfully, aftermarket products have been created to significantly reduce the cost to make it reasonable to replace a battery on a Prius; somewhere between $2k to $3k with DIY kit.

It's a stupid idea to finance parts for a vehicle when the value exceeds financing a whole new / used vehicle. If you end up totaling your vehicle, you're still out the cost for just the financed parts. You've essentially put yourself way upside down on a depreciating asset. Pretty sure insurance isn't going to cover the financed parts when they total a vehicle out. Tesla should have allowed right to repair and manuals to fix their wastes of space like Toyota did for the Prius. I know it's a hybrid, but hybrids are looking to be less of a hassle to maintain and best of both worlds. It's a trend to keep milking people for every last penny with financing every damn thing.