Car: 2012 F10 BMW 520D
Join Date: 23rd January 2010
Location: Halifax, UK
Thanked 137 Times in 124 Posts
I'm surprised you struggled to find an Accord forum, typeaccord.co.uk is the largest forum dedicated to the 7th and 8th gen Accord. Ask the question over there too..
Anyways, both those codes are not related to the battery being changed in my opinion and are both relatively common parts that fail on this car.
However if the lights have gone out, it means the ECU has not detected them in a number of consecutive runs and as far as it is concerned, the faults are clear.
So for now, I wouldn't worry too much. Glow Plug relay sometimes indicates one of the glow plugs is shot rather than the relay itself but at 83k miles I wouldn't expect this..
As I say ask the same question on typeaccord.co.uk for more answers.