Any idea why the k and n causes this. I presumed that as the airflow wasn't getting measured until after the filter it wouldn't be a problem.

Can anyone suggest a suitable alternative to the k&n. bearing in mind that dude to the front end conversion there's no longer space for the original filter and box. 'Apparantley' - I've never checked under the bonnet of a standard one to compare the differences in space.

Would fitting a cool air system be an option or is best to avoid k and n completely?

Thanks

Ross. 2002 / 52 Range Rover Vogue 4.4V8 with 2012 front end and rear light cluster conversion.

Might be a shot in the dark but... On Mercedes W140 S Class owners were fitting K&N airfilters and having similar problems. It turned out to be the oil coating on the filters - it was coating the MAF senors and causing the isues. Upon cleaning with degreaser and fitting the correct filters back in the problem never reappears.

I think you can fit the original type filter still but the k&n types are fitted as they are a straight fit. If you want to fit the originals then the inner wing will need to be cut away as I understand.

I have the k&n fitted and although the engine light can come on sometimes it usually goes out after a day or two. The k&n. does make it sound better when you put your foot down. However try degreasing it and see what happens. 2009 Vogue TDV8 Nara Bronze
2002 Vogue V8 Zambezi Silver
1986 90 Pick up Deep Bronze Green
1978 Series III SWB Deep Bronze Green