JamesTurner Posted April 3, 2020 Share Posted April 3, 2020 About a month ago now my fiesta st engine light came on and along with it a loud hissing noise. Sounded like an air leak so I got it tested and it come back perfectly fine, where do i go now? Only mod done is a sound symposer delete. 1 Quote Link to comment Share on other sites More sharing options...
Eg1993 Posted August 27, 2020 Share Posted August 27, 2020 I have this exact same problem just happend to my 2005 zetec s 16v. I was thinking it is an air leak from one of the hoses, did you ever find out what it was? Quote Link to comment Share on other sites More sharing options...
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