So do we get rid before our warranty expires or do we pay for an extended warranty (at what cost?) One thing is for sure, we couldn't afford a £10k repair bill.
You have to remember a REx failure is a pretty rare occurrence, less than 0.1% chance. Out of the 150,000 i3's on the road, I would guess less than 10. Sucks to be the 'lotto winner' on a REx failure, but chances of it happening are pretty slim.
The extended warranty costs three to five grand, depending on length and mileage limits. Subtract that from the trade-in value of a 4-plus year old i3, and you are getting close to what you could sell the car for un-repaired as salvage.
I know of one i3 owner with a REx failure in the USA, with BMW refusing to do warranty repairs or do any good will portion, because he used Bimmer Code to hack/bypass the REx start restrictions set in US models. Rather than pay for the repair, the guy simply now treats the car as a BEV, and is still driving it.
There are also independent mechanics around who might tackle the job for a fraction of what BMW charges, picking up a replacement REx engine from a salvage yard, or actually diagnosing what is wrong and repairing the engine instead of replacing it. There are several outfits in Eastern Europe actually buying wrecked/salvage i3s from the US, importing them, using some for parts, and rebuilding others for use/sale.
2015 i3 Rex, Capparis White, Tera World, Technology & Driving Assistant, Parking Assistant, Harman Kardon Audio System, 19 inch 427 wheels, EVoInnovate EVSE