New battery & Alternator causing Trans. Failsafe Prog

[bcredliner]

Originally Posted by mcfee03

1. Was running OK-ish after the DISA and CCV replacement, but the battery was not charging, indicating a dead alternator.
2. BMW airbag check (see detail below)
3. Replaced alternator, jump started car with OLD battery. Engine drove weak/lights were dimming on/off but NO failsafe error came up...
4. When replacing Alternator, broke the Auxilary Water Pump, bought a replacement
5. Replaced battery, car starts every time but immediately goes to Trans Failsafe

Could it be rejecting the new Auxilary water pump? Do I need to register new parts to the ECU?


*MAY be unrelated* But... I took it to BMW Sydney for the airbag recall check. Drove fine there. When they gave it back to me, it was incredibly weak. I took it back immediately. They used some "powerpack" to jump start it immediately. I would normally leave it on jumper cables for 30 mins then start.



I have not cleaned it with MAF cleaner- but is dust likely to cause this? It is also a bit broken... http://imgur.com/9p3iSPF

No need to let ECU know you have changed aux water pump.

The MAF may or may not be the problem but I would replace it with an OEM part because it is broken. I wouldn't even bother cleaning it. I wouldn't ever take the chance anything could be sucked into the engine.