Audi Repair Questions? Ask a Mechanic for Answers ASAP
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What kind of vehicle is it?
Which error code was stored that the workshop deleted?
This cannot be, if the motor lamp is on, an error is also stored in the memory.
It is possible that the error will be deleted after the engine is switched off, so the memory should be grounded before switching off the engine.
When the lamp lights up, the motor has detected an error and also stored a firmware code in the memory.
Either an unsuitable device has been used for reading out the error, or the error clears itself when the motor is switched off.