[eyal]

hi
im having an issue with my 2008 bmw 335i coupe where the starter will crank but wont start

at first it was intermittent

then I would erase codes and it would be ok for a while

then some of the codes wouldn't go away after deletion

now it just cant be trusted to start again and it didn't for a few days

so I brought it to a mechanic that works only on bmw and Mercedes he is convinced that the problem is the dme ecu he says he tested the different sensors giving the codes and the wiring and he says that the computer isn't giving the ground to those sensors

when I talk to sia electronics that repair ecu they say that it doesn't seem to be a computer related problem according to the codes

they say it might be a low level of oil which is strange as I had an oil change done very recently and the oil level indicates full (it is possible that the oil level sensor might be faulty I guess)

before all this it was going into limp mode regularly

here are the codes that do not delete easily

3100 boost pressure control deactivation
2a80 intake vanos activation
2a85 exhaust vanos activation
30cf wastegate activation
30d0 wastegate 2 activation

here are other codes I have

2ef5 map thermostat activation
2a9a crankshaft inlet camshaft synchronization
2e85 electric coolant pump communication
2abd boost pressure sensor overrun
2caa oxygen sensor before catalytic converter
2ca6 oxygen sensor heating before catalytic converter

any help would be greatly appreciated

[Wilson335i]

Crank sensor maybe?

[eyal]

I don't know it is possible but when tested the sensor responded
but it is not activating along with the other sensors
not getting the ground signal

[Wilson335i]

With the amount of codes you have I would say you should probably bring it to the dealer , have them do a 160$ diag unfortunately and get the 100% truth it's worth the money for the diag but the repairs you should do at another independent shop! Good luck

[eyal]

looks like it was a bad power to the connector between the sensors and the dme so tightend the pins on the connector problem seems solved for now but well see over the next few days if it comes back

[Rarhha6]

Originally Posted by eyal

looks like it was a bad power to the connector between the sensors and the dme so tightend the pins on the connector problem seems solved for now but well see over the next few days if it comes back

Can you show me what connectors you tightened. I am having the same problem with the same codes I have A 2008 BMW 535i and I am going crazy