C30 Engine : C30 Reduced Engine Performance - Again!

[VolvoRob38]

Hi all, long time no Volvo...

Currently got a c30 2009 1.6d that has started showing Reduced engine performance message again after I put my foot down and whipped it round a roundabout after picking up an Indian. Take away, not person.

Had this pop up a while ago which if I remember rightly was linked to my accelerator peddle sensor, and revs idling at 1500rpm. Cleaning the ECM I think it is, under dash in passengers foot well, with contact cleaner sorted the problem out. However, this time round there are no probs with accelerator peddle and revs, just this message. I do notice a bit of a delay in acceleration when I put my foot down, like it hesitates.

I plugged my DICE in today and there are a few errors relating to climate control and audio information panel, but the one that looks most likely is "Glow relay control - faulty signal". Is this related to spark plug(s)?

I have read on hear that other had issues with exhaust temp sensors, oil pressure sensor, and fuel filter, so am tempted to replace those as well because I am assume relatively cheap?

The things that concern me is reading about blocked DPF pipe for 1. Do all Volvo's have a DPF pipe, how can I check? And can this be cleared simply by going for a long drive? I only do very short journeys at the moment, which I thought might not be good for the car at all.
The other things were; air filter to turbo hose being split... I dont know if my car has got a turbo, has it? It doesn't drive like its got one anyway. A split air filter pipe, but couldn't see anything, and would this cause reduced engine performance? If yes, then what about a lose connection between the air filter and the radiator? I try and attach some photos, but there are 2 screws missing I think from when the garage removed my bumper, twice, to fit a new horn after an MOT fail, and they didn't replace them. Assuming they were there in the first place.

A little help from you knowledgeable people will be very much appreciated.

Thanks