2011 Volvo C70 Questions

All 2011 Volvo C70 Questions

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The car goes into limp mode with the warning. Dealer replaced the Throttle Body. Got it back today and it did the same thing. Electronic or mechanical problem? Air injection relay? Any ideas?
Service center can't find problem. No codes stored in system. I even drove to the shop with the alarm going off. The only way to stop it is to put the top down and back up. Am worried about safety. Help!