2C7E fault code after changing vanos solenoid.

N

nick_l

Senior member
 Essex
I’m a bit stuck.

I had a sticky vanos solenoid on the intake side. Tried cleaning didn’t fix so replaced. Since then the car has been running like an absolute pig.

Scanned for codes and I’m getting 2C7E - Lambda probe on the catalyst, trimming control.

Anyone have any ideas what should be my first check. Would a dodgy vanos solenoid be the cause of this?
 
Did you reset the adaptations after changing the solenoid?
I have seen instances where stuck solenoids cause odd adaptations that then cause poor running when new solenoids are fitted.
 
Jfgoldfish said:
Did you reset the adaptations after changing the solenoid?
I have seen instances where stuck solenoids cause odd adaptations that then cause poor running when new solenoids are fitted.
Click to expand...

No I haven’t done that. Could you explain how?
 
To reset the adaptations, use INPA, ISTA or a decent scan tool. What are you using to read your codes?

Alternatively, a forum member local to you will probably do it for a couple of beers!
 
Unfortunately I can't help you with anything Carly specific. If you are local to Northampton I would happily plug my laptop in for you.

No guarantee that it will fix your issue, but starting with a clean slate is always my first step when diagnosing a random code like this. Often it goes away and never comes back! :thumbsup:
 
Appreciate the offer I’m in Dagenham so probably a bit too far.

I’ll try and see if anyone down my way has ISTA or INPA.

I have been thinking about getting ISTA as it looks like a very handy tool.
 
nick_l said:
I have been thinking about getting ISTA as it looks like a very handy tool.
Click to expand...

I highly recommend it. :D
The cable I use costs less than 15 quid and the software is free. It has saved me and friends a fortune!
 
If you prefer plug and play you can also reset adaptations with a C310+ scanner from Amazon for about £50 or so.
 
ph001 said:
If you prefer plug and play you can also reset adaptations with a C310+ scanner from Amazon for about £50 or so.
Click to expand...

I have considered one of those just to keep in the car.

I’ve ordered a Dcan cable so will give ISTA a try once it arrives.

I’m gonna put the old solenoids back in and see if anything improves. I may just have a faulty new solenoid perhaps....
 
nick_l said:
I’m gonna put the old solenoids back in and see if anything improves. I may just have a faulty new solenoid perhaps....
Click to expand...

I read the advice as being that the old solenoid had made the car adapt to it, and that now with a good solenoid in there, the car is effectively making allowances that it no longer needs to?
If my understanding is correct, then putting the old solenoid back may make it run better as the car is 'used' to that one.
It would not prove anything was wrong with the new one though?

I accept my understanding may be way off on this, so stand to be corrected (and learn a little more)
 
enuff_zed said:
I read the advice as being that the old solenoid had made the car adapt to it, and that now with a good solenoid in there, the car is effectively making allowances that it no longer needs to?
Click to expand...

You are spot on. And probably explained it far better than I did!

Just a couple of weeks ago, my friend was quite quick to blame the new solenoids he had purchased for his 318i. After resetting the adaptations the car runs beautifully.

One of the solenoids he removed didn't work at all (the other was partially blocked). The adaptations for that camshaft were maxed out. This screws up the valve timing when a working solenoid is put in its place without letting the car know first.
 
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