Good morning,

Can anybody help me..

I have a 2006 Focus ST3 that revs up and down on idle, this has since brought the esp light on and says esp system fault.

I have been told this is a common problem with the mass airflow sensor?

What I would like to know is can I clean them? Also where is it located and what does it look like?

New ones seem expensive??!!

Thanks in advance for your help..