The engine error light have started coming on and flashes now and then after last oil change. And the error code is 22 which again is air temprature or air temprature sensor maybe? Its not on all the time, it comes and goes and can be off for long periodes.

I have both Kev mods installed - O2 and fuel mod.

Anyhow - the bike starts and runs like normal. Should I do something with this immideately or can it wait until the bike is up to next service (with valve clerance and all the stuff....) ?

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Suzuki AC 50 -78 owned from 83 to 84
Kawasaki Kh 100 Es 81 owned from 84 to 86
Honda Transalp Xlv 600 -97 owned from 01 to 05
Honda Nx 650 Dominator -98 owned from 07 to 10
Triumph Tiger 955 i -01 owned from 10 to 13
Yamaha XT660Z Tenere ABS -11 owned from 2013 and present bike.
Honda Crf250L -12 my bike in Thailand.

You are about the fourth or fifth person to have this problem (intermittent error code 22) in the last year. It happened to me about three or four years ago.

It is either coincidence that when you changed your oil it happened, or you knocked a wire/disturbed a connection to the Kev mod or AIT sensor when you did it. Every time this problem has raised its head, it has been down to a loose connection where the Kev mod is tapped into the AIT sensor's wiring.

Read this thread...

http://www.xt660.com/showthread.php?t=24104

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Yeah, the same happened to me. Check for loose wires to kev fuel mod.