Selling for other people often ends in tears. I would strongly advise against this, especially for a car.
For a start, you will be charged a non-recoverable listing fee, plus a selling fee based on the value of the vehicle. So you may not be earning money from the sale, but you could end up losing it.
Have you considered what would happen if the buyer isn't happy with the car or claims that it isn't correctly described? At the very least, you will still have to pay the listing fee - would your friend be happy to repay this? You will also be charged for the selling fee and to recover this you would have to open an unpaid item case against the buyer.
Have you considered what would happen if the buyer isn't happy with the car, or claims that it isn't correctly described? It's you who advertised it, and will be liable to receive negative feedback.
Still worse, what if the car really isn't as described - or proves to be unsafe? I've been there! Some years ago young friends who were visiting one day happened to meet my neighbour and agreed on the spot to buy his car. They paid in cash and collected it the next day. Unfortunately a radiator hose split on their journey home. The husband decided to ignore the engine temperature warning light and the engine was seriously damaged. Being caught in the cross-fire of the bitter dispute that followed is not an experience I wish on anyone.
