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Old 08-13-2012, 04:10 PM   #1
Registered User
Join Date: Aug 2012
Location: London
Posts: 2
My Ride: 330i
330i Auto 2001 - Power Issues & Misfire on Cylinder 2

Hello - Im new to this site.
After taking my 330i to the garage today, I have been told that I may have a faulty ECU.
When I drive the car and between 10 - 20mph in slow traffic and then need acceleration, sometimes the car will hesitate to pick up and drive sluggish. The net effect is the car wil lose power and rumbles on with 5 cylinders operational, the engine warning light will glow. I must therefore pull over to re start the engine and it drives fine after every incident.This happens most days but when driven like a sports car at top speeds it drives perfect.

The codes logged from the diagnostic unit were:

(191) BF Oxygen Sensor, bank 2 , after catalytic converter, insufficient heat output
(239) EF Misfire, Cylinder 2
(001) 01 Fuel ignition, cylinder 2 activation
(190) BE Oxygen Sensor, bank 1 , after catalytic converter, insufficient heat output

My mechanic says the O2 sensor would not cause the problem that I am describing
My mechanic is experienced and before running his own BMW garage he worked for BMW.
When he test drove the car he could not replicate the fault I was having when I drove it - which I find weird as It happened to me everyday.
Although driving home today - it did not happen. I do not feel the problem is cured though!
My mechanic feels the ECU may be playing up as he has done various tests & eliminated any injector faults and No 2 cylinder. The problem must be electrical as when I re start the engine the car runs perfectly on all six cylinders???
If I send my ECU off to be repaired or tested I will have to payover 300.00 plus; and this may not cure the problem. Could my fault be attributed to something else or is this the best road to go down? Should I just go to a BMW dealership and have them diagnose the fault? Any advice please
would be appreciated.

Last edited by djpops; 08-13-2012 at 04:14 PM.
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