Been getting a "P0671 - Glow plug, cylinder 1 - circuit malfunction" recently. Took the engine cover off the other day and wiggled the plug cables around a bit and the fault went away for a couple of days but has returned. From what I gather it could be the harness, the ECU, or just the plug itself. Not sure where to start with checking the harness but thought if I was going to attempt that, maybe I should just replace all the plugs as they aren't that expensive. Has anyone had a go at this themselves? Or if you think it maybe isn't a recommended DIY job (read some horror stories about plugs snapping into the block etc), would you trust an indie or just go dealer for this?

Any help/recommendations appreciated.

Also, if you have a trusted engineer in the South East, please share details (via DM if you prefer).

Thanks

G