Help us help you. By posting the year, make, model and engine near the beginning of your help request, followed by the symptoms (no start, high idle, misfire etc.) Along with any prevalent Diagnostic Trouble Codes, aka DTCs, other forum members will be able to help you get to a solution more quickly and easily!
Is there someone in the scanner danner realm who can speak to a problem we have with a 06 Mustang in "limp mode"? We're new to the Automotive industry at this higher level of diagnostic trouble shooting. Currently we have an ICON T8 scanner from Harbor Freight. Any assistance pointing us in the right direction solving this problem will be greatly appreciated!
We'll need more information. What codes are you reading? If you are, truly, in "Limp Mode" you should have some trouble codes.
Otherwise, you may be experiencing a lack of power or performance that is not a "Mode" of operation. The more information that you can offer, the more help you are likely to receive.
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"Understanding a question is half an answer." I have learned more by being wrong, than I have by being right.