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That's your catalytic converter temperature warning light. The ECU goes into a safe mode when this sensor is triggered and will change the idle. You may have over heated it during the dyno runs or it maybe clogged with carbon deposits. It also maybe being affected by the change in air fuel ratios as a result of the dyno tune. Park it until it cools down and drive it like normal and see if the warning light goes off again. If it does, check the converter for deposits.
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