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I don't see how the garage that fitted it could have damaged it remotely after 7000 miles, it has nothing to do with them.
i didnt mean it had anything do do with the garage that fitted it, was just thinking, should it of lasted longer, or maybe a faulty one, im not sure how long it has been broken for, i have only driven my scoob for around 2 weeks this year.
I think it was working when I mapped the car last, I can check the logs. but if it goes it goes. If you had an intercooler pipe come off on boost that can be enough to wipe out a lambda sensor as there is lots of unburnt fuel that goes into the exhaust, and the thermal shock cracks the ceramic, when they go badly they rattle.
Just to add, I have had my MY99 for 8 years now. I have used it virtually everyday over a variety of journeys etc. I replaced the original one at 64k that was 18 months ago with an OE version and have had no problems. I would be very disappointed for it to fail in such a short period.