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[Marks DTM Calib]

What you have to consider is that the car with the faulty MAF has been effectively correcting the mixture for the bad MAF reading over time right up until the point where the correction values hit a limit and flag a code.

Put said MAF on a car which has close to zero correction value and the mixture will be way out until the learnt values also hit the end stop and flag a code.

I see so many cars where people dive in and change the O2 sensor then delete the codes, the engine runs all be it, in some cases, lumpy, and the code disappears for a bit.....until the learn values slowly correct and the code comes back some time later!

[terry paget]

Thanks Marks. Last time I bought a MAF meter it was £100 plus on trade club, and Vx dealer advised me to try e-bay, which I did, eventually getting one for about £100. Now I look on e-bay and they are £22 postage paid.
http://www.ebay.co.uk/itm/Opel-Omega-Vectra-2-5-3-0-Mass-Air-Flow-Meter-0280217519-0-280-217-519-/300705399172?pt=LH_DefaultDomain_3&fits=Model%3AOmega+B&hash=item4603704184
Are these any good? I ask because I am in 2 minds whether I should scrap or repair the donor 2.2. It needs a new head gasket, head planing, all connected gaskets and studs, cam belt kit, plus the MAF sensor, £300 to £400.

[Andy A]

Terry, I'm not sure about the EBay one but this one http://www.eurocarparts.com/search/434720550/p/home is identical to the original and a bit cheaper. 

[Marks DTM Calib]

The uber cheap Chinese ones are total rubbish, best avoided.

I recall that the MAF on the 2.2 is the same as used on the 1.8 and 2.0 DBW from the Astra/Vectra of similar era.

The genuine items are Siemens VDO which can be got for around £70 from the likes of euro car parts (or car parts 4 less which is the same company)

[Andy A]

The uber cheap Chinese ones are total rubbish, best avoided.

I recall that the MAF on the 2.2 is the same as used on the 1.8 and 2.0 DBW from the Astra/Vectra of similar era.

The genuine items are Siemens VDO which can be got for around £70 from the likes of euro car parts (or car parts 4 less which is the same company)

£86.40 from Euro Car Parts at the moment. 

[Marks DTM Calib]

£71.94 on Carparts4less  (strange as its the same company as eurofartpants)

Then use code SAVEME75 at the basket and get a further £5.40 discount bringing it down to £66.54 

[Andy A]

Thanks Mark I'll check Carparts4less before eurofartpants in future.