Hi guys,

I've had my rex now for about a year and ice noticed is getting progressively worse to drive when cold. The CEL (knock sensor code) comes on upon startup and stays on until the car is about a quarter up the temp guage. The light also comes on intermittently when at operating temp.

When it's cold and accelerating, it surges back and forth gently. The afm, plugs, leads, air filter are all about 12 months old.

Any ideas? I thought maybe injectors or even the afm is playing up again?