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Thank you for your question, my name is ***** ***** I am a fully qualified vehicle technician with over thirty years in the trade, hopefully I can help.
The yellow light and the loss of power are both indicating that one of the engine management systems has sensed a fault, this could be due to a number of things such as a faulty sensor or an induction system air leak.
The first move will be to get the engine codes read from the EOBD plug to determine the cause of the problem.
Once armed with codes the remedy will be easier to determine.
I hope this answers your question but do please feel free to ask any further details by replying to this thread.