I've just got my 300c 3.0 back from the garage, I had an oil leak repaired for £850 Since then my car has lost power and the red lightning bolt appeared. The lightning bolt has now gone, but it still has a loss of power, there's a hissing noise when I accelerate and a burning smell. I've put in a resistor, but I'm still having no luck Does anyone have any ideas what this could be? Cheers