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E90/E91/E92/E93 (2006 - 2013)
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  #1  
Old 07-16-2014, 06:13 AM
Sy999 Sy999 is offline
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Low power with check engine light

my 1 series e87 has low power not going above 60, with check engine light. diagnosis shows 2ca3 oxygen sensor heating 2 before catalytic converter, 2a67 valvetronic internal fault, 2a6b valvetronic power limitation servomotor, 2ca2 oxygen sensor heating before catalytic converter. Please help?
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  #2  
Old 07-16-2014, 06:26 AM
fdriller9 fdriller9 is online now
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Sounds like the valvetronic motor is going. That's what is limiting power.

The O2 heater circuits are mainly to increase efficiency of the sensors. They do not affect performance as much
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Old 07-16-2014, 07:17 AM
Sy999 Sy999 is offline
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I checked bmw mechanic and he said its the valvetronic motor and one other mechanic was saying my catalytic convertor is gone so once its replaced the valvetronic errors will go. am so confused and at some points it does drives well above 60km/h.
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Old 07-16-2014, 07:38 AM
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CALWATERBOY DUE CALWATERBOY DUE is online now
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Quote:
Originally Posted by Sy999 View Post
I checked bmw mechanic and he said its the valvetronic motor and one other mechanic was saying my catalytic convertor is gone so once its replaced the valvetronic errors will go. am so confused and at some points it does drives well above 60km/h.

Whelp, cat's unlikely to cause the problem. I side with the BMW mech - Valvetronic Motor.

THIS is an eccentric shaft sensor replacement, but illustrates Valvetronic Motor R&R
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Old 07-16-2014, 09:01 AM
Sy999 Sy999 is offline
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Ok thanks, bt how cn i sort out the oxygen sensor errors.
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Old 07-16-2014, 10:53 AM
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Originally Posted by Sy999 View Post
Ok thanks, bt how cn i sort out the oxygen sensor errors.

I've not had the error. But, I'd first check power & ground to the sensor - Good?

If good, check continuity across the heater - Good?

If good, replace sensor - Good?

You get the idea. What is diagnosis but an educated guess? The better the education, the better the guess.
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Old 07-16-2014, 11:08 AM
fdriller9 fdriller9 is online now
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The O2 faults indicate that both pre-cat sensors, heater circuits have failed. This is rare and my guess is there is short on the harness, rather than a failed heating element.

It could also be that your car is dumping fuel onto the sensors (from the bad valvetronic motor), which caused the heater elements to fail.

I would get the valvtronic issue sorted first. Then worry about the O2 sensors. Like I said, the sensor itself is still fine, it's just the heating element is bad.
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