Looks like an intake leak to me, causing the turbo to overboost and provide 'implausible' signals via the sensors to the PCM. The wrong air / fuel mixture will have a knock-on effect to emissions, so could cause the NOx fault.
I'd be pulling the MAP sensor out to see how dirty it is, and on the hunt for a split charge hose, intake hose or air intake manifold.
I'd also check the turbo actuator is working properly. At ignition on, it should perform a reset procedure which you can observe whilst someone turns the ignition on and off. 2015 Range Rover Autobiography 4.4 SDV8
|