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Hi, did you disconnect the battery when you unplugged the seat sensor? If you unplug any part of the srs system the ecu logs it as an srs system fault which needs to be cleared by someone with the correct obd tool. Any time you work on the srs system always disconnect the battery. After fitting the new sensor on my car I had no warning lights, it's been about 6 months now and still all good.

@andybowie8590 Thanks for quick answer ! No I did not disconnect the battery, just unplugged all seat connectors and took the occupancy sensor out. It strange that with a faulty sensor the srs light came on and off depending on if where was a passanger or not, and now with a brand new sensor it's permanent regardless...

Honestly speaking, rust/corrosion it is a knowing issue at all Mazda line, corrosion can be repaired at a cost if you love the MX-5. The Z4 is a VERY good car from all points compared to MX-5, however it cost almost twice the MX-5 :/. I would repair the corrosion on the MX-5 if it is not too crazy expensive. or change the MX-5 color.

One of these days I'll get round to making more videos, I've got plenty ideas just never get the time.

Well my plan of attack was to start with the easiest and cheapest things first. Spark plugs are cheap and although its a bit of a faff getting into them it's not too hard. After that I'd buy one ignition coil and try it on each cylinder in turn, again not expensive just time consuming. Vacuum leaks are another possibility but there's a lot of small rubber hoses at the back of the engine and it isn't easy to see them all, I checked the ones I could see but to do it properly you could borrow a smoke generator or take it to a garage thats got one, cracked or split hoses are a definite possibility on an older bike. If none of those had fixed mine im not sure what my next move would of been. Sorry my video was no help, hope you get it sussed mate, as you know they're great bikes when they're going the way they should

@@andybowie8590 ive checked for vaccum leaks, new plugs, different set of coils, tested all sensors, exup is working good but still bike missfires.

@@Yamaprilia if you've done all that (including crank sensor?) It doesn't leave much. My problem was the fuel pump was cutting out intermittently, as I said that was down to the immobiliser but the fuel pump relay could give you the same symptoms or even the pump itself could be going bad. To check its running properly you could stick a 12v led in the back of the pump power connector making sure its + and - are the right way round and then if it flickers off when the engine is running you'd know its losing its power supply. Beyond that your guess is as good as mine. Maybe try swapping an ecu from a bike you know is running if you knew someone locally that has the same year r1. I take it you know the fuel is good, no water getting into the tank for example (check the overflow drain hole inside the filler is clear) especially if the bike gets rained on, and I take it its not stale fuel from sitting off the road for months or anything as simple as that?

@@andybowie8590 bikes only done 8k miles. Harldy ever ridden. It does it with fresh fuel in it. But its ok when cold. As soon as bikes hot it missfires

​@@Yamapriliadid you solve the issue dude? My R1 has got the same