The main problem is that on A class the ECU is mounted on the intake air track and the MAF is part of it. So, you can not replace only the sensor, must replace the whole ECU. I'm looking for the manufactorer of the MAF sub block (which will cost a portion of the whole unit). Or, can I buy another MAF and use only the sensor from it? Or is there a place in Ireland or UK where I can send it for repair?

Do you have a MBz Dealer near you? The parts department should have a parts breakdown with pictures of your ECU and A Class engine. It may not be possible to get just the one MAF sensor. You may have to buy the whole ECU assembly. But you can try if you can find an auto parts house near you.

Your best off hitting up a junkyard to find a spare, either that or shell out the cash for a new one. Thats the draw back of euro cars (parts and availability)

I sent mine to be repaired,they split it and renewed the MAF worked a treat,and saved me £750!The firm I dealt with advertise on Ebay.

The ECU and MAF are combined as one unit so spare parts cannot be purchased from mercedes it is sold only as a complete unit, the unit is also coded to the chassis of your car so a 2nd hand one will not work.

There are companies out there that repair these units fo as little as £300 search the net for mercedes ECU repairs.

jib