qc2

belt

if you're using a newer disc, the update should initiate automatically. if it doesn't then it's most likely an issue with the disc/drive. You only need to force DL if reverting to an older version.

Check the main relay for dry joints.

use Honda CVT oil for the gearbox, and 0w20 oil for the engine which is Honda's latest recommeneded grade. I persoally use Exol Honda spec 0w20 which is great value. As for spark plugs, perhaps try cross referencing the original part numbers with Denso. I find their IK and IKxxTT range of iridium plugs to be great and much cheaper than NGK equivalents and have been using them as long as I can remember. I use IK20TT plugs for my K20 FRV and K24 Accord. An online dealer like Cox Motor parts would have everything you need in terms of original Honda items and would also provide the required part numbers to cross reference elsewhere with for spark plugs.

can't help on the ECU i'm afraid, but have you checked the main relay? i've had issues with older civics in the past where dry joints on the main relay cause warm starting issues. quite a simple fix, just a case of resoldering the dry joints if that's the case. back then i took the relays to a tv repair shop to do and it'd take them 10mins.

there are 2 systems for facelift (2006-08) and pre facelift (2003-05). the dvd drives although similar in appearance are not interchangeable between the 2 systems and have different rear connections. pre facelift drive part number 39540SEAG010M1 (typically the ones harder to find in working condition) facelift dvd drive part number 39540SEAE110M1 In the past i've replaced the optical drives inside and have also dismatled to clean the optics in helped in some cases. Cartronics is one company that comes up as one that can carry out repairs, avoid them. They will charge £80 inspection fee (though refunded off eventaul repair) but then quote close to £600 for the eventual replacement of the drive.

they're pretty cheap and easy enough to swap out. i'd keep an eye out on ebay for a cheap one to swap out if your fuses all seem fine. Quince

yes, those are the ones.

Lings honda is a good resource, Cox themselves also list part numbers. Even on ebay listings for aftermarket parts you can easily identify the OE Honda part numbers where other part numbers are provided as references

won't work, totally different systems despite similar appearance.

the £20 disc if it's the seller on ebay, i've tried. although appearing genuine they're copied and certainly didn't work for me. behaved exactly like a crap copy i've experimented with before in the past. You can't tell based on appearance unless you compare side by side with a genuine disc, the textures on the print face are different.

I use https://www.coxmotorparts.co.uk and www.amayama.com

I remember calling aroud at the time, Holdcroft Honda also quoted a similar price. The battery was listed at 1132.66 ex VAT, fitting was down being included with the £99 ex vat IMA fault investigation charge which included the usual healthcheck

i replaced mine in 2017 and it was around £1400 all in. Warranty I received was 3 years unlimited mileage. This was via Lookers Honda Orpington

oh the glory days of Honda Karma! I'm glad you're loving your Accord. Similarly, I'm back in another one having missed the one i sold 3 years ago. The Civic Hybrid i've had in between has been great for my commute but since Covid i've had no more commuting so jumped at the chance of getting another Accord.