2002 Renault Clio air bag and service light on

Have you tried the wiring for sips bags under the seats as this is common area of wiring disturbance,i.e. if you tighten the connectors. but you will require a diagnostic tool to reset the codes.

Have you had a look at this similar problem:

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I had the same problem I just fiddled with the wires under the passenger seat making sure they were all connected and the light went out with no further problems