Hi all - had the same fault recently 0355 which was intermittent - had my local garage do a diagnostic check and he recommended swapping the coil and spark plug into different slots to confirm a coil malfunction. Swapped coil from 5 to 4 and spark plug 5 to 2.
Fault duly returned and code 0354 came up which confirmed the problem coil. Spark plug ok and as they were changed in June I would not have expected a problem.
New coil fitted £125 plus VAT.
Went on line looking for coil 90919-02251, as stamped on the old coil, and found prices from £8.95 ( China ) to £137 plus vat in UK.
Seems that there are cheaper alternatives which match up so I shall investigate further. Having watched the mechanics replace the coil I know I could do the job on pots 2 -4 -6 myself but 1 3 and 5 means removing hoses etc to get at them and then, would I have the tools ?
Great car though and a little treat in my old age !!