hi
i have a punto 2005 1.2 8v, i have a problem with misfiring called AA out and fault come up as p0351 which they said was coil pack they have renewed the coil pack but still the car is misfiring and still code p0351 they have said got to take to garage any one with any ideas what it could be now, also any one know a good garage near dartford that dont ripped you off and are good on fiats, thanks in advance

Did they check which pack wasnt firing and change that one or did they just do both? or even just random?

they checked which wasnt firing and changed this 1 only

have a read of this https://www.fiatforum.com/punto-guides/52068-punto-coil-ecu-checks.html

if i buy a secondhand ecu from breakers does it need coding/resetting or can it be plugged straight in

you will need body computer, ignition lock and key to go with it

even for the ECU that the coil plugs into i fought they was plug and play, when new but if i get second hand will i need everything

new are plug n play, but that isnt what you asked

One might find this youtube link about coil testing interesting:

have got ecu off this is the number on it P3HW303/19BBW37, have rung a few places but nobody has heard of this ECU the only other numbers on it are
4hwc1ypff
14405
55195640 do32 12v
anybody know any one near dartford kent that does ECU repairs or know what there doing to help me out please

These people will test and repair ECUs and have had good reports on this forum.

http://ecu-testing.com/contact_us.html

Last time I looked it was £100 for the coil driver fault and you wont have any key problems as they fix your own ECU.