Longish post unfortunately
I have had my 2008 520d Touring for approx 4 weeks, but only had operational for a few days of that due to various errors, which I now think maybe erroneous. So far it’s had approx £1000 (DPF, EGR valve, glow plugs, glow plug relay and boost control valve) spent on it, and still not running properly. One day it’s ok, the next it’s not running well. On both occasions it showed error codes relatiNg to the EGR, even after it was replaced. But the garage verified it was cycling when the ignition is switched on. So I got hold of Ista to try and work out what was going on. It shows different errors each time I run it. I saw elsewhere the importance of having the correct battery fitted. When I checked the cars ecu shows it’s set for 80Ah AGM, and doesn’t show any changes. But in the boot is a std Halfords battery but it’s 95Ah. It looks fairly new though.
My question is :
Do I replace the battery with an 80Ah AGM type?
Try and update/code the current battery in to the cars ECU?
In the hope that the car will operate consistently