The engine light came on when i travelled to bath and back, then dissapeared for some time, funny u say the plugs, my light did come back on after awhile when i put the denso plugs in, the car is still running well and fast, took it back where i purchased it GKS of ivybridge but i have a bad feeling they just robbed me of money, and mugged me off, as i was told not to worry as even new cars get engine lights, i mentioned to the mechanic who seemed not really with life, that on research i've heard the inlet manifold flaps get stuck open, so he put it on the computer, but suprise suprise he came back saying its code 1518 and the intake manifold runner control is stuck open, is that a sign he didn't really know, and just went on what i told him, or not, so i dont feel alot of confidence in GKS of ivybridge Car sales mechanics now, and had to pay GKS £41.13 to be told this, so i got a second opinion from my local plymouth garage, he did feel a bit of play on the intake, and did feel this could be an issue, but to replace the plugs back to ngk laser's i had in first to test if that was the result to the light first and if the light only popped up on long journeys before it could be a budget lamba put on it or they may have never replaced the lamba and just cleaned it up, as an ngk lamba should only really be run on the car, i heard ford redesigned the intake manifold flaps, as it being a problem, but do any companies make a stronger intake manifold than ford's, if anyone knows