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Discussion Starter #1 (Edited)
Just learnt a 600+ pound lesson. If you are a DIYer fiddling with coding, please read; and hope you won't make a mistake as I did.

My car is an Oct 2012 built F30 320d with automatic transmission and climate control. At the beginning of this summer, I found my ac stopped working. Checked by using ISTA-D shows there's a "Valve status unknown***8220; faulty code in the IHKA module. Then booked in to a reputable local BMW specialist who suggested the compressor needs to be replaced.

Since the original BMW part costs over 1200 GBP including VAT, I thought its probably better to buy an used one off ebay, which I did. Here's when disaster happened.

According to BMW ETK and realoem and all other parts resellers' website, there are 2 compressor variants of 2012 F30 320d, one with clutch and one without:

http://www.realoem.com/bmw/enUS/showparts?id=3E12-EUR-10-2012-F30-BMW-320d_ed&diagId=64_1882

Because mine has auto trans and climate control, it clearly should be the one without clutch. It turned out I'm wrong after mechanic disassembling everything on the way showing it did has a clutch. Then, in order to get this done ASAP, I just let them sourced a brand new OE part (430GBP).

However, they informed me this afternoon that the new compressor is still not working and the only possibility they haven't ruled out is coding. All of sudden, I realized something that could be the cause. I immediately went to the garage with my laptop and ENET cable and did some tests on my theory and icy cold air came out of vent......

Here's the thing. Last December, I upgraded the head unit to NBT system with DAB tuner by myself. Apart from coding on the HU-H module, I also coded FEM based on suggestions from others. The one thing vital here is the change of build date. As NBT was not available in 2012, I changed build date to 0713 and coded FEM along with other relevant control units.

One related question is why every catalog says my car should have a compressor without clutch but the fact is opposite? My guess is Oct 2012 was on an edge of changing build spec (with clutch before that date and without after that date). By modifying the date in FEM, the control unit thought it suppose to seek for newer valve control instead of older clutch control which just not there. This will also explain why there's a faulty code as "Valve status unknown***8220;. Based on my limited knowledge, a traditional clutch based compressor shouldn't transmit valve message to computer. So, at the garage, I use Esys to recoded FEM and IHKA to original build date and; as mentioned, everything worked.

Since the very beginning, there's nothing wrong with hardware but literally one digit mistake during coding.....

Although there seems to be, to some extent, faults of the gentleman who made the initial diagnosis, I still choose to bite the bullet and paid the full bill considering the fact that they are likely never expect customers screwed up coding. Anyway, an expensive lesson for me; and hope it can also benefit you guys.

BTW. contact me if anyone in the UK (preferable in Southampton area) needs a compressor for 2012 F30 320d, I have both types of it. Hope I can recoup some costs....haha

Have a good weekend!
 

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Thanks for the heads up. Given the coding discrepancy even the foremen at dealer service departments can misdiagnose. These F-chassis cars may not be too DIY-friendly except for basic maintenance items.
 

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Thanks for the heads up. Given the coding discrepancy even the foremen at dealer service departments can misdiagnose. These F-chassis cars may not be too DIY-friendly except for basic maintenance items.
Yeah. But it's also a consequence of several coincidences. If the NBT upgrade were made on last summer or, even autumn, I probably gonna figure it out the very next day. Or, actually, when I've been told there's a compressor variant not suppose to be there had been installed, I did feel there could be a build date issue in my head believe it or not. But thanks for the recently disastrous schedule, I just not bothered to catch the lead......Anyway, it's kind of something that has to happen. haha
 
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