Ista errors

[Dewald_Bark]

Hi guys. Would someone be able to assist with interpreting these errors? On the vavletronic limitation, could it be the the valvetronic motor, the eccentric shaft sensor or possibly something else? Then on the O2 sensors is it just time to be replaced (vehicle has done 302 000km)? Thanks

 

[DarrylvanNiekerk]

What are the issues with your car that lead you to check codes?

It is possible that an issue or code upstream or downstream could have an effect or cause a code but not necessarily mean those items need to be replaced.

Does the car battle to start, does it idle rough, is the economy shot, does it have no power at low revs, high revs or across the full rev range?

 

[Dewald_Bark]

There were a few rough starts with stalls yes.

The fuel economy is nowhere near where it's supposed to be... Highway driving the at the moment is 9.8l/100km.
Overall power is definitely down, but very noticeable on pull away and high end.
2 weeks back she threw out a half engine light, when all the above showed popped up.

 

[Dewald_Bark]

The Valvetronic error was cleared, but it doesn't come back immediately. The engine light comes back on after about 80km

 

[Peter@AEW]

Attend to valvetronic first.
Clear codes
Drive car and only then see whether the O2 sensor errors come up again.
It I not unusual for cat errors to appear as a sympathetic error to cam issues

 

[Dewald_Bark]

Attend to valvetronic first.
Clear codes
Drive car and only then see whether the O2 sensor errors come up again.
It I not unusual for cat errors to appear as a sympathetic error to cam issues

That brings me back to the first question, could it be the motor or eccentric sensor? Where is a good starting point?

 

[Peter@AEW]

A good starting point is you going through the ISTA test steps for the valvetronic.

 

[Dewald_Bark]

A good starting point is you going through the ISTA test steps for the valvetronic.

Ok will do thanks.

 

[operator323]

Carry out a test plan on ISTA,it ll show you how to solve the problem

 

[MOE 000 GP]

My m135i was throwing valvetronic issues last year with a check engine light... But after bmw re programmed the vehicle it went away I think they reset the adaptation values