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BMW 3-Series (E90 E92) Forum > BMW E90/E92/E93 3-series General Forums > Regional Forums > UK > UK Technical Forum > Braking Load & Engine Malfunction Warning



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      03-14-2018, 05:09 PM   #1
Elante
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Braking Load & Engine Malfunction Warning

Hello all. I'm new to this forum & hope someone can point me in the right direction with an issue on a 2009 318i. I've had a good poke about both here and on other forums so excuse me if this has been covered before but I've yet to find anything helpful.

I have an idrive warning display showing High Braking Load and one for Engine Malfunction alongside yellow dash brake warning light and red Engine Check Light. This resulted in a misfire, poor performance and starting problems.

However, the car has been seen and received a Brake Pressure Sensor at the ABS unit, coil packs, all four injectors, thermostat, a full service to spec and a full diagnostics check and is now running better than ever.

BUT, the display still shows these warnings so how do I clear these warnings or do they point to further issues?

For reference codes were found including 2EF7 (Thermostat), A559, (Instrument Cluster), A6DE (Mirror/Sray Nozzle Heating), 30C1 (Oil Pressure Control), 2AFD, 2AF8 (Nox Sensors) and a 3702 (Brake Vacuum).

I sort of know my way around a car but all this seems at best mainly unrelated and at worst barely relevant now.

The codes were cleared on the latest repairs, car, as mentioned, running beautifully but warning lights and bleeps becoming irksome.

All input gratefully received.

Thanks for reading.
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      07-03-2018, 02:04 AM   #2
wrongmark
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Mine appears to have the same warnings a week after it went in to a BMW dealer for a “quality enhancement” to do with the brake vacuum. The only error code I’m getting is 3702 Brake Vacuum plausibility. No rough running problems or noticeable changes in braking.

I’m returning it to the dealer this week for them to look at it. No doubt I’ll have an argument on my hands when I suggest that this is connected to the work they did last week.

I guess if you think your problem is fixed, just clear the error codes using something like Carista or Carly and a cheap dongle.
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      07-03-2018, 03:58 AM   #3
Elante
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Warning

Hi wrongmark. If your car is showing the same issues you need to stop driving NOW. I don't want to be alarmist but after even BMW had seen the car and the above codes logged and cleared they couldn't pinpoint an issue. I managed to find a very enthusiastic young local technical chap more into electronics and his laptop than cars although he did know his way around. After 2 hours of fiddling on his laptop and 2 journeys with him around the block he said he too couldn't be decisive but that an oil pressure fault kept showing up. At that point the car gave up and the engine would no longer turn over! I have a neighbour who has his own workshop and has been working on BMW and Minis for months who wryly quipped that he wasn't surprised as that engine is the biggest piece of junk to leave Germany. Not helpful but I've since heard numerous tales of woe about BM's 2.0 petrol!!!! I'm sure thats a subject of debate on here. Anyway, the car has been up in the air, sump off, engine inspected and the crank has welded itself to its bearings among other damage due to lack of oil so its totalled. Replacement engine and fitting from around £2500 and if I do it myself an engine of unknown history can be found for about £1200! Its going on Ebay soon spares / repairs!!!!!!!
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      07-03-2018, 09:17 AM   #4
wrongmark
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Wow... funnily enough I did get the engine oil pressure static error 30C1 a couple of times recently as per my other posts on here:

https://www.e90post.com/forums/showthread.php?t=1496404

Mine does not have iDrive and so I get the red EML and the amber brake warning on the dash. As I said the only error I'm getting now is the 3702 with the brake vacuum.

I've also heard numerous comments about the N43 engine on here and from independent BMW specialists and all of which were bad. One specialist just told me to get rid.

I ended up cleaning out the engine oil hydraulic valve and the Vanos valves and the 30C1 error has not returned after at least a few hundred miles now.

The engine seems to be running fine, no hesitation, no noises, MPG looks fine and so I'm not convinced that the timing chain guides are broken as per other suggestions. I change the oil at least annually myself, always Castrol Edge and Bosch or Mann oil filters.

I'll struggle to sell it now with the EML anyway. I said to the wife that I'd break it for spares on ebay in the worst case scenario. The interior is near perfect, so it would be a shame to scrap it. BMW dealer that had it for the recall told me how everything was spot on with it.
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      07-05-2018, 06:06 AM   #5
wrongmark
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Just an update for anyone reading this: I took the car back to the BMW dealer that did the brake vacuum recall ("Quality Enhancement"). They just called and said it needs a new brake vacuum pump. Not sure if this is the brake servo unit itself or not. They (or BMW) have agreed to cover all costs without me having to argue (which I had expected to have to do). Let's hope this sorts it.
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      05-28-2019, 02:06 PM   #6
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Braking load & engine malfunction warning

Hi,
I am having the exact same problem like Elante, in fact the car is in the garage as we speak.
I was wondering what you guys did. Did you manage to fix it ?
How much did it cost in the end?

Many thanks
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      05-28-2019, 03:48 PM   #7
Geokon
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Braking load & engine malfunction warning

Quote:
Originally Posted by wrongmark View Post
Just an update for anyone reading this: I took the car back to the BMW dealer that did the brake vacuum recall ("Quality Enhancement"). They just called and said it needs a new brake vacuum pump. Not sure if this is the brake servo unit itself or not. They (or BMW) have agreed to cover all costs without me having to argue (which I had expected to have to do). Let's hope this sorts it.
Did you manage to sort it ?
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      05-31-2019, 10:57 PM   #8
wrongmark
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Yes. Whatever the dealer did fixed the brake problem. I then replaced the oil valve at the bottom of the engine which sorted the ‘oil pressure static’ problem.
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      06-01-2019, 04:02 AM   #9
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Brake vac/oil /engine braking messages.

Hi Guys,
I have a 2009 318i E90. Recently I have had endless warning lights come on, they have been cleared only to return. The CAT has been cleaned, coil replaced and now the engine warning light is on continually. An diagnostic guy had deactivated the NOX sensor as he claimed this was causing the problems. The lights stayed our for 2 days and now they are back.
The following is now displayed:
2EF7 thermostat, activation.
30C1 engine oil pressure control, static.
3702 brake vacuum, plausibilty, engine electronics. The car is reliable and drives fine. I think it is becoming a money pit and is getting sold as soon as this crap is fixed.
Are these faults genuine or is it spurious? Can all this stuff be deactivated?I know you have to believe the displayed messages as the car is designed to be maintained this way. The Ultimate Driving Machine............I don't think so.
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      07-14-2019, 04:36 AM   #10
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update

Hi,

I had the NOX sensors changed 5 weeks ago , warning lights disappeared only to come back a few days ago( exactly the same as described above).
Took it to an independent garage, the checked the car and the 3702 brake vacuum plausibility error came up. They checked the car , nothing visible was identified, said they made some adjustments and the codes disappeared, but as soon as I drove away from the garage, same warning lights reappeared.
The guy told me that he cannot find anything and now I have probably have to get it to the BMW dealer.
BTW , the car drives and feels fine, including when braking.
Is there an official recall for vacuum brake pumps for N43 engines E90?
Wrongmark would you know anything about it?
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      07-14-2019, 05:34 AM   #11
Geokon
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Quote:
Originally Posted by Dermobear View Post
Hi Guys,
I have a 2009 318i E90. Recently I have had endless warning lights come on, they have been cleared only to return. The CAT has been cleaned, coil replaced and now the engine warning light is on continually. An diagnostic guy had deactivated the NOX sensor as he claimed this was causing the problems. The lights stayed our for 2 days and now they are back.
The following is now displayed:
2EF7 thermostat, activation.
30C1 engine oil pressure control, static.
3702 brake vacuum, plausibilty, engine electronics. The car is reliable and drives fine. I think it is becoming a money pit and is getting sold as soon as this crap is fixed.
Are these faults genuine or is it spurious? Can all this stuff be deactivated?I know you have to believe the displayed messages as the car is designed to be maintained this way. The Ultimate Driving Machine............I don't think so.
Any updates, did u fix it?
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      08-07-2019, 02:46 AM   #12
Dermobear
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Brake vac/oil /engine braking messages.

Update: Rear R/H driveshaft replaced, this cured ABS light. One sensor replaced on the brake servo, there are 2 sensors on it and am replacing the other one this week as 3702 is still showing, Brake Vacuum Plausibility.
Also still showing: 30C1. Engine Oil Pressure Control Static and 29CD Combustion misfire on Cylinder 1.
Oil has been changed and the engine flushed. Engine low oil pressure message kept showing but has now gone out on its own as has the oil low quantity message and the oil quantity checks fine. It seems that this is normal, as the new oil makes its way round the engine and cleans it out, the codes can disappear. Frequent oil changes seem to be the way to go here and using flushing oil. Old oil, when it gets sticky can also cause the oil sensors to give incorrect readings. 29CD: This is getting a new coil this week, hopefully this will cure it. Coil and injector problems seem to be a common occurrence. I have replaced a coil before and the CAT has been cleaned. The car drives fine and is reliable, I get an occasional misfire and hesitation. As it is becoming a money pit I think once all this is fixed I'm going to sell it as soon as I can. I have had a few BM's and they have all been ok but the modern ones with all the electronic crap in them just seem to be a disaster.
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      08-11-2019, 05:39 AM   #13
Geokon
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Quote:
Originally Posted by Dermobear View Post
Update: Rear R/H driveshaft replaced, this cured ABS light. One sensor replaced on the brake servo, there are 2 sensors on it and am replacing the other one this week as 3702 is still showing, Brake Vacuum Plausibility.
Also still showing: 30C1. Engine Oil Pressure Control Static and 29CD Combustion misfire on Cylinder 1.
Oil has been changed and the engine flushed. Engine low oil pressure message kept showing but has now gone out on its own as has the oil low quantity message and the oil quantity checks fine. It seems that this is normal, as the new oil makes its way round the engine and cleans it out, the codes can disappear. Frequent oil changes seem to be the way to go here and using flushing oil. Old oil, when it gets sticky can also cause the oil sensors to give incorrect readings. 29CD: This is getting a new coil this week, hopefully this will cure it. Coil and injector problems seem to be a common occurrence. I have replaced a coil before and the CAT has been cleaned. The car drives fine and is reliable, I get an occasional misfire and hesitation. As it is becoming a money pit I think once all this is fixed I'm going to sell it as soon as I can. I have had a few BM's and they have all been ok but the modern ones with all the electronic crap in them just seem to be a disaster.
Thanks,
please let me know if the replacement of the sensor stopped the brake vacuum plausibility error coming up.
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