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i haven't had a failure but i do have an extra with the car at all times. you can get one on ebay for pretty cheap. i'd rather have a $35 part laying around when i need it than to have to get towed in to a shop and reamed for a few hundred.
If you need to poll to determine if you should buy a $25 part that can leave your car totally disabled, which has failed numerous times in the past, I vote you wait to find out.
Why would you even question whether you need one when others have shared their unfortunate experiences with this part and the misery it can cause when it does go bad?
Just chalk it up as one of the "charms" of owning a 993, buy a spare (or don't) and move on.
I'm with Kelly on this...result of any poll is irrelevant for practical purposes IMHO. Even if you conclude that 98% of the respondents never had a DME relay failure, when and if it ever happens to you, you will not care that the probability was "only2%". Instead you will be pissed that you could have avoided being stranded at the side of the road had you had ponied up and just bought a spare.
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