2016 F30 330e Drivetrain Error Repair Estimate

Lanesra44

Hi all, hope you can help.

I've received a £4k repair estimate from the main dealer after my 2016 F30 330e developed the dreaded drivetrain error. Car has done 101k miles. Was under 100k when issue first became known, and their Warranty Manager said that had been noted. So not sure why there are charges for a replacement cell module if warranty is a factor. The quote is for a replacement cell module and associated labour and various bits and bobs to get it done. I initially had them investigate the issue when it first popped up a year ago. They replaced the auxiliary battery which 'fixed' the issue for a few months before returning. Last November the issue escalated to 'Battery not charging' which would clear after powering off the car , and disappear. Took it into the dealer and they diagnosed a faulty high voltage battery under the boot but could not do any work as they needed to schedule more cars for this 'specialist high voltage work'. So they said I could continue to drive the car until they got in touch when the car could be booked in for repairs. Roll on to April, the issue became severe (battery not charging error not going away, car in limp mode one morning) and car completely died at a traffic light same day (dashboard flashing all over the place), couldn’t engage in 'Drive' and had to be recovered by AA to the dealer. Turns out car was now only running on the 12v battery in the boot and that had run flat as the hybrid function had stopped working altogether.

My question is whether this is a reasonable estimate. Could this be done cheaper elsewhere? The dealer has serviced this car from new hence took it them in the hope they'd not point fingers at any other party. Should I be paying for this at all since I raised the issue with them before it escalated and resulted in a now expensive fault? I also suspect the KLE may have gone too based on other posts, but the dealer hasn’t quoted for that yet. I worry they'll' 'discover' that after I've already shelled out for a new cell module and end up lumbered with another bill to replace the KLE. Feels like I know more about what they need to do than they do.

The Service Advisor has been completely useless.

Any advice would be greatly appreciated.

Lanesra44

Thhis is the detailed estimate for ref: