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Temp Gauge & SES light problem

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I know this thread has been floating around amongst a few members that have had this issue. While driving, your temp gauge jumps to red and the SES light comes on or it comes on after resetting the key. I had this annoying problem and took it to my mechanic a few times and had everything reset in the DME. It was giving some error "coolant temp plausible" whatever that means?

So I decided to have the temp sensor replaced and the problem is gone. I have not seen the problem for over a month now - before I would have the problem every other day. If anyone has any questions please feel free to ask!