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Hi threedogs - I run two Patrols - one LWB & one SWB both ZD30 engines - have had many interesting challenges with both - mostly to do with performance - LWB 2001, SWB 2003 - there are subtle differences between both engines which even the local Nissan nurds Dealership 'computer says no' so called mechanics don't even know - my LWB has for two years had a performance problem especially when towing heavy loads - power drop off uphill between 2nd & 3rd, engine management light always coming on - changed all vac hoses and many other silly parts while always thinking it was a vac problem and turbo not getting the message and of course the age old question should I block the EGR - have had this mother off three times for cleaning etc and still no difference - reading one of the many forums I thought the MAF change is worth a try - Nissan dealer wanted £130 sterling for a new sensor - research on ebay UK produced a guy who supplies the guts for most MAF sensors - simple, 2 cross head screws to remove old sensor - slot new one in and reconnect terminals - BINGO - my truck now runs like new with no problems whatsoever - any other info I will gladly supply as over the last 5 years I have dismantled and rebuilt most of the running gear, brake systems etc etc - all the best Patroljock