For some time I have had the yellow engine light on sometimes its on sometimes its off and my car seems a bit sluggish and under powered I have had a carbon clean and had throttle body cleaned and had the plastic timer thing replaced the fits on to the throttle body but still having problems anyone any ideas 2007 1.8 petrol s40 many thanks

 

Read the codes, and let us know what they are. Otherwise there are only about 2,000 things it could be.

 

It says p2008 intake manifold runner control circuit open bank 1

 

Here's what Volvo says about that code. Part # is 31375551 if curious.