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I think it's done by your ECU - the engine's electronic brain if you like. What's your idle at? If you think it's high you might have a (vacuum) leak on the inlet side somewhere so the ECU is having to compensate - check all your hoses are connected/not leaking.
 

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It's UK so 99% will be diesel - very few jdm imports (or US) here. I did say look for leaks inc vacuum, forgetting that unlike petrol there wont be the typical vacuum leak I would be looking for with petrol. I don't know how diesels regulate their air intake? so maybe EGR or something? Still hoses to check first. Some Nissans and Toyotas I recall in the past would automatically raise the idle if accessories were being used, I guess to keep the alternator output up to prevent battery drain - maybe something's been left on to make it want to idle higher.
 

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I wouldn't have a clue how to check for codes, as I've been running a 1993 vehicle for the last 16 years. They weren't computerised back then and were easy to work on.
Yes, 850rpm does sound a bit more nearer the mark - about the same as my previous vehicle.
I know what you mean, but, about 10 years ago my son had a rough running vw polo so unable to find fault I bought a cheap code reader off ebay which helped point me in the right direction. It was less than a tenner, and I've used it on every car I've had since. Just for engine codes tho - I just read codes (write them down) google what they might mean, fix what I think, then delete the codes - not failed me yet. On some cars I just accept that it records certain codes (like glow plug relay code on my NV - starts and runs fine with it) My reader's a model u480 but there are tonnes out there.
Disclaimer - some people say they can knacker ECUs so CAUTION. Min'e been OK - I only use it to read and delete the codes, if I haven't fixed it they come back - I don't use it for 'live' monitoring of parameters, which might be where problems start. Every car in the EU since late 1990s I believe has an ODB socket. It's behind the 'card holder' panel under the driver's cup holder on the UK NV. For example, on a petrol car it'll tell you which cylinder is mis-firing so you know which HT lead to wiggle or plug to swap to see if the fault moves with it.
Pin-pointed my wife's cam position sensor failure on her rough running (BMW so not proper ; ) mini. £30 for the part from eurocarparts, 10 mins to change - lovely job, no garage fees.
 

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Looks like I need to get one. Do I need any particular one for the NV200?
No I've had the same one for few years, used on VW, Citroen, Nissan, Volvo and Mini so far. Beware - some people have blown up their ECU with them apparently - just google it.

Update to my 1990s comment earlier, just googled it - 1996 mandatory on USA cars, 2001 Mandatory on EU petrol cars, 2004 mandatory on EU diesels
 

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To be fair if there was anything airbag/abs etc (I don't have 'transmission' codes as we use gear levers over here ; )) I would put into garage anyway, but simple diy running problems (plugs, sensors, misfires etc) I'm happy to play with and try to keep money in my pocket
 
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