What it means
MECHANICAL means the reason the car is at auction is a mechanical problem: engine, transmission, cooling or similar. The body may be undamaged. The listing usually does not say what exactly failed. Sometimes the code is combined with a secondary body damage.
What it means for a buyer
This is a gamble: the fix can be a cheap part or a new engine. Check the run status (does it start? drive?), the mileage and known problems of the model, and budget for the worst case.
Cars in our database with this damage right now (primary or secondary): 25,562