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Did you read out the fault codes in the ESP/BAS/ABS control unit(s) at all to see what codes are set when this light is on?If not this needs to be done.If there is a code setting in these control units this can disable the turbo depending on what the code is.That code would need to be diagnosed to then locate and repair the fault then repaired and the code cleared to resolve this issue.
In some cases, no codes will come up unless the fault is occurring so the codes need to be checked in those control units when the light is on and the vehicle is acting up.I have had to drive the vehicle with the SDS machine plugged in to monitor and check for codes when the fault occurs to then locate and repair this issue.
This may be an intermittently failing steering angle sensor or wheel speed sensor as these are most common.
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