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How can I investigate alert "Check Injection" 2004 Megane Deisel 1.9?

My 2004 Megane 1.9 Deisel's 3 year warranty just ran out and the service light has come on with the message "Check Injection" on the dash. Its running fine at the moment.
Renault want £43 just to run diagnostics. Any ideas?
Julian Rogan, February 2007
another web site (forget which one, but try google) suggested it's caused by failing heater plugs.

al, March 2007
link Click here to see other fixes for Renault Megane.