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The "slow down" warning light just began to blink on my 1999 355GTS. Has anyone had a similar problem? Is it a faulty sensor or is the exhaust temperature actually high? How can you tell? Would appreciate any suggestions. Do I need the dealer? Thanks.
 

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Common problem with modern, fuel-injected Ferraris. Its to indicate problems with the catalytic-converters. It sometimes is the case when the cats plug up, but this is seldom. Most of the time its the ECU's which have these cat sensors hooked up to. A quick diagnosis if its just one slow-down light that lights, locate the ECU's and switch connections. If the other slow-down lights, then it was that ECU.

If switching ECU's doesn't change, then it could be the sensor.

If you are handy with tools and have your appropriate Workshop manuals and Parts Catalogues, you can do this at home. Otherwise, go to your dealer.
 

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You should play it safe and not drive the car hard if that light comes on. You wouldnt want the cats to catch on fire and make your F355 into an expensive piece of smoldering metal.
 
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