go in ask them whats there minimum charge, it may be 15 mins or half hour, then say you want 15 mins or half hour of diagnostics, that way they shouldn't rip you off.
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mine was done for £30, not with a fiat garage though, was with a fiat specialist
Seicento Sporting, Modified Front Bumper, Saxo Custom Spoiler, Abarth Side Skirts, Bad Boy Bonnet, Afterburner Rear Lenses, 4" Powerflow Exhaust System, Abarth 14" Alloys. IN THE PIPELINE:
-40mm Drop Check out my site: http://badboygaz.mysite.freeserve.com
FIATForum stickers available PM me for details or see: https://www.fiatforum.com/forum/topic.asp?TOPIC_ID=10000
When you get a quote for the diagnostic ask them if they will discount the cost against any repairs you get there. You are after all saving them the necessity of doing their own diagnostic check.