MAF for 2004 Z4 E85 3.0

J

Jamturbo

Member
Hi,

I am looking to replace the MAF on my Z4. Currently there is an aftermarket one on there and I would like to know if the recommended genuine part is a VDO 5WK9642Z.

My model is a 2004 z4 E85 3.0i.

Grateful for any tips.

Thanks
 
If I was you I would avoid aftermarket Maf's, they are of doubtful quality, been down that road myself on my Z3, cheap ebay one didn't work, ended up getting a puka BMW one solved the issue straight away. Did try cleaning the old one with Maf cleaner but all that did was kill it completly. Always go for Bosch or Seimens which are oem brands. Other reputable brands are out there VDO has a good name as do NGK and Hella, buy cheap pay twice with the lesser known makes.
Oem parts link here https://www.realoem.com/bmw/enUS/part?id=BT53-USA-06-2004-E85-BMW-Z4_30i&mg=13&sg=15&diagId=13_0995&q=13627566983
Diagram here https://www.realoem.com/bmw/enUS/showparts?id=BT53-USA-06-2004-E85-BMW-Z4_30i&diagId=13_0995

The VDO one you are looking at cross references with the BMW Part number 13627566983

Hope that assists with your choice.
 
Thanks for the responses. BMW want £340 for their MAF.

Looks like I will have to bite the bullet. Reason why I might need to change is that I got a warning light with 3 codes. 2 for the fuel trim and the other for the Mass Air Flow system.
 
I would think that the bad Maf is causing the fuel trim code, if the Maf is reporting wrong airflow the ecu will be telling the fuel sysstem to add more fuel and it is reaching the max limit it can add fuel hence the fuel trim code. You could try spraying Maf cleaner on the sensor inside the Maf and see if that restores it. Must admit all it did to mine was kill it completly. Oem Maf fitted and that cured my problem. Another cause of fuel trim codes is air leaks in the induction system from Maf to throttle body with split or holed rubber pipes and intake bellows. Visual inspection may reveal holes and splits but a smoke test is a sure way of finding any leaks. I recently had a 2.2 with bad fuel trims, it was adding 20% more fuel due to air leaks between the Maf and throttle body. Sorted that side but a further smoke test then revealed cracks in the plastic cam cover around one of the spark plug wells. Replaced that with a used part and that solved the air leaks and put the fuel trims back to normal.
If you have software that can look at live engine data its useful to look at the short term and long term fuel trims to see what is going on. Just make sure it is the Maf at fault and not just down to air leaks. Live data can also see what the Maf is performing like. Replacement rubbers are cheaper than Maf's.
 
Hi, thanks for the replies. I think it is the MAF too. I did change the DiSA, all the air pipes (inc. PCV), intake boot, cleaned the ICV. Next step is just to buy it. Fortunately the MAF is an easy replacement. Thanks again and happy New Year.
 
Brief update, I have run a smoke test to rule out any leaks. Couldn't find any. That just leaves the MAF now but before shelling out £360 from BMW, any brands or shops you might recommend that are worth considering.
 
What about a used one? Machine Monkey is breaking his Zed so might have one?
 
So, I decided to chance my luck and bought a used VDO Siemens MAF. I wasn't 100% sure if this was the offending part but so far so good. Car idles smoothly and dreaded warning light hasn't come on. Will continue to monitor.
 
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