Baby BMW Forum banner
1 - 9 of 9 Posts

·
Registered
Joined
·
17 Posts
Discussion Starter · #1 ·
Hi,

Has anyone come across this issue before?

F20 116i Sport.

Started and drove and was driving as normal this morning, but after 10 mins of driving, 'drivetrain error' came up and went into limp mode. Pulled over and restarted a couple of times but limp mode still there. Starting the engine takes a few seconds longer than it has ever done normally. Engine feels weird and rougher than normal. Plugged in a dirt cheap OBDII reader which has thrown up error code P1338, which according to google means 'Camshaft Position Sensor Bank 1 Open Circuit Or Short To Positive'

On a side (and probably unrelated) note, idle has been a little rough for as long as I can remember- well, not 'rough' as such but more of a slight shudder every now and then that can be felt through the steering wheel and gearstick. But two BMW specialists have told me this is normal.

So, to summarise symptoms:

-Limp mode after 10 mins of driving
-Permanent 'Drivetrain Error'
-Takes unusually long time for engine to start
-Idle/engine feels rough
-Code P1338
-Has always had a slight shudder in idle but probably unrelated.

Any help or advice would be much appreciated!

Thanks,
 

·
Registered
Joined
·
23 Posts
Could be a stretched timing chain - anything over 50,000 miles and they can be an issue. The 116i has the MINI/PSA (Peugeot Citroen) 'Prince' engine that is well known for this. I've had to do one in a 207CC at 58,000. Taking the cam cover off and trying to fit the crank/cam locking tools will confirm if the chain has stretched enough to throw the cam timing out.
 

·
Registered
Joined
·
17 Posts
Discussion Starter · #3 ·
Thanks GetDownShep.

Mine is 75k miles.

Could it possibly be a bad sensor? Youtube ETC from what I found indicates either sensor or timing chain.

Garage I took it to said chain, but didn't seem totally sure and suggested it best I get a second opinion from a beemer specialist.

Car is now driving fine with drivetrain error or starting issue- is that normal just because the codes have been cleared?
 

·
Registered
Joined
·
520 Posts
If you can get a code reader on that can show you live data for camshaft and crankshaft sensors then you can see if both sensors are giving complete signals and if they correspond as they should.

Since you had a camshaft open circuit error it might be that the ECU doesn't know when to fire the spark. Also bear in mind that the fault could be in the wiring as well as the sensor.
 

·
Registered
Joined
·
17 Posts
Discussion Starter · #5 ·
thanks for responses so far.

Have spoken to a couple of mechanics and they agree it points to the timing chain, but am going to get a second opinion and get the codes read properly and diagnosis explained to me properly.

If it's timing chain, looking at a quote of between £1,200 to £1,500 to replace. Is this a reasonable amount?

Also, I'm wondering if anyone knows if this could be down to bad or dirty VANOS solenoids or something similar? Do the symptoms match? I don't want to be spending that sort of money to replace the chain if it turns out to be VANOS related.

thanks
 

·
Registered
Joined
·
520 Posts
I would hold off on condemning the chain until you have looked more closely at the sensor error. The fault you gave was open circuit/short to positive. This indicates a fault with the sensor or wiring. If you were getting issues with plausibility that would be more likely to point to chain.
 

·
Registered
Joined
·
17 Posts
Discussion Starter · #7 ·
am honestly no closer to finding a solution to this.

Car has been driving fine since (albeit I've not used it much and certainly no long distance).

Where I am with it now is that all I'm being told is that it's most likely the timing chain, and when I suggest to any garage that it could be something else (i.e. just the sensor? Tensioner? Dirty/sticking VANOS solenoid? etc etc) I'm just told no, without real explanation as to why not.

Now being told that to replace the timing chain, also have to replace the sprokets on the camshafts at the same time. The BMW ones are £500 each. Looking like the whole job being £2,500+... On a 2014 1-series..

And I'm still not convinced that other possibilities have been ruled out.

Or that there's actually a problem at all. Could just have been a random sensor fault? I don't know.

Anyone with any good suggestions very welcome. Reaching the limit of stress with this.
 

·
Registered
Joined
·
520 Posts
How many garages have you spoken to? I would also ask specifically what they will do to fix the open circuit fault as part of the timing chain replacement.
 
1 - 9 of 9 Posts
Top