How can I reset service interval codes on a Renault Megane 2007 without going to main dealer?

SOURCE: radio code for renault megane 2000 1.6

Here is a link for your problem, good solution..
http://www.fixya.com/support/t564842-renault_megane_1998_lost_radio_code

SOURCE: renault megane 1.4 16v

could be a sensor will need to hane a fault code read to detrmine where the fault is

SOURCE: Rain Sensor wipers Renault Megane

Either the replacement sensor the windscreen technician should have fitted isnt connected properly to the glass or it has developed an intermittant fault - quite common with Renaults especially megane scenics and grand scenics....

SOURCE: code do radia renault megane 2006 15 dci

The radio will have to be removed from the car dashboard .
Then please quote the MAKE + MODEL of your radio plus ALL the LETTERS and NUMBERS on any LABELS , BARCODES or STAMPED IN THE METAL CASING.
Also confirm the MAKE of CAR it is fitted into.

SOURCE: my renault megane cc's airbag warning and service

Quite often this is something simple like the connector under the front passenger seat .(often yellow in colour)

If not, then your local garage should be able to deal with it.

They will plug in a tester to read + reset the lights. If the fault persists , then they will deal with it.

It is a worthwhile investment to buy one of these testers ( OBD Readers).

You can get a fairly simple one off Ebay for £2o/£30 and these can be very useful in diagnosing (+resetting ) any future faults.

They work on most of the later cars