Recently had the coolant transfer pipe replaced on the 2005 545i. Immediately after that I have have been getting Increased Emission check engine lights, and the 2 error codes in my scanner
2E6A- knock sensor signal 3
2E6B knock sensor signal 4

I have tried to erase these codes, but it comes back. I am planning to take it back to the mechanic. Anyone has any suggestions in the meantime? This repair needs removal of intake manifold cover and pan valley cover.

 

I havent had to do this repair yet... Definitely going to DIY it but from the notes and videos I have those sensors are dead smack in the area needed to work. My guess is that a wire could be pinched from reinstalling the manifold they need to be moved to the side when putting it back on or actual damage to the sensors themselves. I would just take it back to him bro, he just might have to snatch everything back off to make sure. Worst case if he did damge something U'll need 2 new sensors.

 

ok Quarta2six, I have taken it back to the Mechanic. Let us see what he says. Can you guide me to good DIY post in case I need?