Error code P1105.

Did u check all your vacuum hoses for cracks, code is for a vacuum hose leakage from the charge air absolute pressure sensor, check for this at the pipe that comes from the throttle body alone the top of the engine & down to the turbo intercooler hose, vacuum hose that may be cracked is near way the pipe connects to the intercooler hose, good luck.

Hi all vacuum hoses are fairly new silicone. But I will check all of them. So are you sayin I MUST have a leak somewhere? The code comes up every couple of days after clearing it. I will check in daylight tomorrow as its now dark here. (Which is the charge air absolute pressure sensor)?
Thanks.

Could this problem cause the car to lose power at higher speeds as it wont go over 80mph and struggles to climb hills. New direct ignition cassette, new fuel filter, new apc valve, new air filter also exchanged mass air flow sensor for a good one; so thinking this is low boost issue now reagarding the possible air leak.

Oh by the way also check if intercooler hose section near to the exhaust cat if the heat as burned a hole in the hose under the bottom facing the exhaust, note that the heat will at some point burn a hole in that hose, so check if that is the case also, just one more thing that I remember for u to look for, good luck, sorry I am not near by to look at the car for u, good luck.

Ive checked all hoses right down to the turbo but cant find any cracks/splits anywhere. Checked apc valve thats good. Im thinking maybe fuel pressure problem. But not sure how to check it. The same code keeps coming up every day P1105 Confusing me now. The car is good until you reach 4000rpm it wont surpass 4000 in 3rd then from there on its like a struggle to climb from 55 to 70 when it eventually reaches 80mph it seems like its at the limit which I know is not right, its bogged down in some way.
Any more ideas would be appreciated.
Thanks.

U are correct in your thinking, yes fuel pump now that u have explained it like that, to check fuel pressure just visit your parts store buy a fuel pressure gauge, then locate fuel injector rail & in the middle of the rain u should see a black screw on cap remove cap & that is the fuel pressure test port, affix gauge pressure hose, & just turn key on, not start just on for now reading should be 38- 40 psi there about, if that checks out then u will now need to drive the vehicle with gauge attached & monitor pressure reading while climbing up in speed if gauge drops low while at high speeds that u have a faulty fuel pump, & u will need to replace it. Good luck post back.