HELP: engine system service URGENT/LIMP MODE

[Dsisco]

Hey guys,

Wondering if anyone can chime in, I have just purchased a 2006 V8 Vantage, this is my 1st aston coming from a myriad of various Porsches & BMW M cars,

Car has done very low mileage, 35,000kms from new with full service history & brand new clutch.

Problem is, every now and then, (particularly if the car has not been warmed up to operating temp before driving) the car seems to go limp mode & starts to run rough, will not rev over 3000rpm & sounds likes its misfires & backfires, with the message ENGINE SYSTEM SERVICE URGENT,

No yellow or red check engine lights come on,

if I turn the car on & off the warning comes off the dash & cars back to normal.

I have scanned the codes straight after & comes up with:

Throttle actuator control system forced, Limited Power

I also have:

Catalyst efficiency below threshold bank 1 &2
But I dont think this is related as I probably need rear 02 sensors & have 200cell cats.

PS, this happened prior to installing the 200 cell cats also so dont think this is related.

Could it be faulty ECU? or software related?

any help would be much appreciated as I dont know where to start & dont want to be taken for a ride by the stealership

[Dsisco]

martindesu said:

I thought an ECU remap was required following the installation of 200 cell cats...

no this is not necessary,

also is unrelated as this fault happened before the 200cell cats where installed