I'll be keepin my eyes on this thread as I'd be very intrigued to know how it pans out. Basically we have a situation here where the garage/dealer has gone ahead and done some work to the tune the best part of 500 notes (300 for the service sounds steep too - but if that included a maf then could be possible, but thought they've covered this with warranty??) without first getting authorisation from the owner. Legally can they do this?
Now as a Synergy owner myself, personally I'd avoid mentioning that it had been installed in the first place, but since our Podman admitted this to the dealer I'd be very interested to know if they use this to try wriggle out of responsibility for the additional (perhaps unnecessary) ecu work. Although I've no warranty left on my vehicle I'd still be very interested to know if the garage can use the excuse that the synergy unit voided the warranty?