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Discussion Starter #1
I have a 2011 325i N53. I have it 6 months now and haven’t had any problems with it until now.

First thing I noticed not right was when I pressed button to start and it cranked but didn’t start. I pressed button again after couple seconds to stop it and it started as normal on second attempt. The same thing happened a couple more times the same day after car had been left resting for a few hours. The car was driving normally once it started.

The next morning it started on first attempt and after driving around a mile it lost all power and just stopped. Currently it will start usually after one or two attempts but has no power.

I towed it to main BMW dealer and got diagnostics done. They reckoned that the problem was the DME and that getting it replaced at a cost of €2,000 should fix it. If it didn’t they might need to replace the injectors.
I got the printout of the codes and towed the car home. There are 20 codes on the list and there is mileage next to each code. Most of them are related to CAS or DSC and have mileage of around 10k miles ago. The ones below are the only ones where the mileage corresponds to when I started having problems.

2AEC DME: Nitrogen oxide sensor, self-diagnosis
2E30 DME: Fuel injector, cylinder 1, activation
2E31 DME: Fuel injector, cylinder 2, activation
2E32 DME: Fuel injector, cylinder 3, activation
30BA DME: Injectors 1, 2, 3 or DME internal fault
30BB DME: Injectors 4, 5, 6 or DME internal fault

The 2AEC code correspond with the mileage when the car first start to fail to start on first attempt.
All the other codes correspond with the mileage when the car started to loss of power.

The car has always run smoothly and never had any misfires. I looked at the service history and at the end of warranty service all the injectors were replaced and so was an NOx sensor. The car has only driven around 30k miles since then.

Since it appears the Nitrogen oxide sensor error occurred first could this have caused the other error codes? If so could it be issue with catalytic converter?

I was searching for info about 30BA and 30BB, it seemed like the most common reason for these codes was faulty mosfets on the DME. But this only seemed to be an issue for MSD80 DME. Would I be correct in assuming that I have a MSD81 DME and is it possible to repair a MSD81 DME? Could it be just a wiring problem or something as simple as a blown fuse?

If the problem is the DME and I get it fixed or replaced, is it likely that I’ll need to replace injectors too or could the 2E30, 2E31 and 2E32 errors be coming from damaged coils?
 

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I was like you humming and haying whether the Nox etc was at fault, same thing as you. But in the end was the injectors combined with a cracked valve cover. I replaced both and smooth as butter now, check your valve cover especially near the oil fill cap and below, i am led to believe this is common to crack and trust me will cause mega misfires, mines did.

I still have to replace the nox sensor and may go down the route of the emulator, but its not causing any issues at the mo.

It does seem odd your injectors may have gone already, i personally these cars and injectors is an absolute disgrace, but remember there is usually a 2 year warranty with these buddy.
 

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It would be around 5 years since the injectors were replaced. Did you have the 30BA and 30BB error codes for the DME/injectors?
 

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I would also say you did well getting 5 years out of the injectors.
Possibly. Though the index 11 variants are proving pretty reliable.
 

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I’m hoping index 11 are reliable.

If those injectors were changed 5 years ago I don’t think they would be index 11. But really, 30k miles on a full set of injectors costing £2k is poor.

I like my 325i but I do constantly question how long I can realistically keep it. It seems that when things go wrong they can be very complicated and expensive to put right.

Hope you manage to get your issues sorted.
 

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I do constantly question how long I can realistically keep it. It seems that when things go wrong they can be very complicated and expensive to put right.
Keep the faith Chris! Mine's nearly 10 years old and 104K on the clock and still going strong. To be fair to BMW, the upgraded HPFP, coils and injectors seem to be holding up well.
 

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Had mine for nearly 3 years and (fingers crossed, touch wood etc.) everything is ok.
Car on 119k and no record of injectors ever being changed.
 

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Discussion Starter #10
Problem here was water damage to DME. It was cleaned and dried out and car seems to be driving fine again.
 
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