Error code 41 - 2003 Aprilia SL Mille Falco

The Chilton and Haynes manuals are your best bet. Order it at your local Autozone or goto the Library and research them online fro free. You can get most of this info for free if you have a library card directly from the Chilton Manuals perhaps the links below will help good luck.

Free Service Manuals how to find

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Service manuals are everywhere in the internet and you should even get them if you search with the correct name. But with a little additional words you can Add:

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http://www.autoeducation.com/
http://workshop-manuals.com/
https://www.ifixit.com/
http://www.auto-facts.org/
https://www.alldatadiy.com/index.html
http://www.freeautorepairmanualz.com/
http://www.haynes.com/onlinerepairmanuals/
http://www.citruslibraries.org/
http://www.autotap.com/techlibrary/vehicle_diagnostic_flow_charts_explained.asp

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BOOT FAILURE TROUBLESHOOTING FLOWCHART
http://www.fonerbooks.com/poster.pdf
http://www.shopjimmy.com/

A very good source on car and truck repair would be from chilton manuals. You can purchase them at https://www.chiltondiymanuals.com
or even better you can go the the public library or login with you library card to look at the chilton manuals online. you might also try looking at these videos:

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1-866-933-2911
https://www.youtube.com/watch?v=Ij9uGuPOAJU

free chilton manuals online