You can test the MAF sensor by unplugging it. After starting it should run funny for a few seconds before the ECU realises it isn't there and should then run okay.
Hello, I’m trying to help my mate out with his poorly defender. If anyone could help us out please that would be amazing! :) (he wrote the below)
“I have a 2003 defender TD5 15p engine, I was driving on the dual carriage way and I heard a noise...