Well car went to stealers yesterday but they could not find the
problem with my error code 17965 and suggested a new n75 valve. I told them that I had already replaced this and they said that they would need the car for at least two days to see if they could find the fault. I therefore decided to use the air inlet spray cleaner to see if that would fix the
problem, well.......
Used a product called POWERBOOST which is similar to 10k Boost. All I can say is WOW! Took 20 minutes to use and the outcome is brilliant and well worth spending £27. It has also fixed my 17965 positive pressure deviation
problem and smoothed out the rough idle
problem I had, so a big thanks to Basstard for suggesting this one and saving me loads of money!!