P0100 is "mass or volume air flow circuit malfunction"
so yeah, it looks as though your MAF is contaminated
Stuff that you need to arm yourself with is:
Isopropyl alcohol spray
(maplins) for cleaning the Maf sensor wires, DO NOT TOUCH THE WIRES AND RESISTOR, JUST SPRAY AND LET IT EVAPORATE
good stuff, not as harsh as Carb cleaner and WILL NOT
damage the wires, it WILL
remove all the contamination.
(raid Penny's make up kit)
Silicon lubricant spray
(Halfords) for the rubber seals on the airbox lid etc. it will lubricate and slightly swell the rubber sealing ring back to original size giving a much better seal. It will also help the induction pipe rubber seal properly on the throttle body, I little spray wiill do you nicely.
for the throttle body (any motor factor) DO NOT USE ON THE MAF, just on the throttle body butterfly only.
To remove the 5 pointed security screws on the MAF
you can use a pair of long nosed pliers on the outer edge of the screw head. A bit of a chew on but will come out,they aren't in too tight. Once you have removed them, get replacement standard cross point screws from B&Q etc... Take the security screw for comparison of thread and length and speak to one of the wise jedi- like pensioners who work at B&Q, they will sort you out mate.
(any motor factor) A godsend when it comes to siezed bolts and nuts from airboxes etc... much better than WD40 poop
Glass cleaner (raid Penny's cleaning cupboard) for the angled mirror inside the MAF sensor
A vacuum cleaner (see Penny for where it lives) to give the airbox a good clean out and to give the airfilter a quick dust off
Now you are armed with the essential MAF and total induction cleaning kit (will last years BTW) you can tackle the job, no more than an hour total
Easy as pie : Fun starts @ 3000!
Go to the tips section Alfa Romeo
Written by Jeff Porter
no less and a God when it comes to technical know how and saving money on buying MAF's when they aren't needed
When you put it all back together, dont forget to rub a little bit of silicon spray on the rubber sealing ring with your finger on the MAF to make sure it gets an air tight seal and use the isopropyl alcohol to clean the electrical contacts on the MAF (once refitted in) and on its multiplug to ensure a good electrical contact.
Get stuck? give me a holla and I will try and help as best I can mate ok