I changed the plugs yesterday and today I noticed a slight misfire at idle. No performance is lost at any point as far as I can tell.
Hooked up INPA and I have the following error:
55 Lambda probe heating probe 2
I also had a look at the roughness and INPA showed cylinders 1,2 and 3 were all running rough where as 4,5 and 6 were 0.0
Then I checked through the analog values and analog values 1 showed that the engine load was at 104.45 mg/stroke (max 7) and the air use of the idle control valve is at 13.00 kg/h (max 10).
On my other car, I had lots of lambda sensor errors and misfire errors at once, turned out to be a vacuum leak. Checked here and it all seems ok. Since there is only one error, the lambda sensor, reckon it needs replaced or should I keep checking for leaks.