My fuel consumption has mysteriously increased. I'm only getting about 27mpg at a steady 80 on the motorway and average consuption is around 27 too. Over 80 and it drops rapidly.
Nothing showing on vag-com.
I've checked the breather hose thoroughly, no splits.
Plugs look fine.
It starts fine and there are no other obvious signs of a
problem. However, when first started cold (outside temp 10 degrees) the idle isn't much above 1000 rpm - I'd expect it to be higher.
I fitted a new air temp sensor to the airbox a while ago as it didn't have one (and a fault code went).
I'm going to look at the throttle body next and change the Coolant Temperature Sensor. (I don't think it's the throttle body)
Any other suggestions please?