Help with fault codes?

[DJLC01]

I need some help rectifying some fault codes that i have on my 2001 cupra 180. When driving on boost (say 4000rpm) and holding it, if i then push the throttle down my engine stutters and doesn't perform. when i then pull up it runs lumpy and on pulling away there's no power at all. with my foot to the floor it revs a little bit and all of a sudden boost kicks in and i'm away again.

i had a the codes read which are:
17608 wastegate by pass vavle - n249 mechanical malfunction (p1200)
17705 turbo/throttle valve connection pressure (p1297)
p0118 engine coolant temperature sensor 962
p0300 intermittant
p0301 cylinder 1 misfire
p0302 cylinder 2 misfire
p0303 cylinder 3 misfire
p1176 after cat limit attained

now i replaced the n249 and no real change,

seat said to change the coolant sensor and the coils packs, and possibly an air mass meter. i think its one thing tripping the rest but can anyone shed some light on it?

 

[DPJ]

So you replaced the N249, reset codes and then it still threw the N249 code?

(vacuum leak )

...but you also need a new coolant temp sensor.

 

[DJLC01]

to be honest i haven't checked the codes since, i didnt because the same syptoms were still there. i did check for a vaccum leak nothing doing really.
i'll change the ect sensor and have the codes cleared and go for a run. cheers
jus a thought tho my coils were changed by the last owner bout 20,000 miles ago, i have a feeling they werent seat ones could that have a an effect?
cheers

 

[DPJ]

Boost / Vacuum leaks are really hard to find sometimes.
Coilpacks try swapping them round and see if you can get a #4 missfire?

 

[DJLC01]

ok cheers DPJ.

 

[DPJ]

ok cheers DPJ.

Wait for someone elses' opinion before you rely on mine.

Hope you sort it.