Peugeot Repair Questions? Ask a Mechanic for Answers ASAP
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The short answer is no, it does not ALWAYS indicate a transmission fluid issue.
What it means is that the system has detected a fault and has stored a fault code.
The code number will indicate where the fault was detected and you then need to have a fault finding procedure carried out relevant to that code.
However, flushing the gearbox and filling with fresh oil can cure a few niggles.