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The option may not have been installed on the car. The other option would be to take the door card out and inspect the wiring, or take the mirror cap off to inspect it.

To lock the vehicle while keeping the key's lock button pushed down for a little longer, try leaving the white line on the centre switch. Keep trying until it works.

The next step is to check the door modules for problems by running a diagnostic scan on the vehicle.

The codes reappear exclusively when the fuel tank is nearing depletion, which is an intriguing indication. You also indicated a hesitation—have you observed whether it occurs within a certain RPM range? Incorporating that detail may assist someone in elucidating the situation.

There must be an absence of black smoke entirely! Perhaps a compromised DPF is the reason for its sale.

Indeed, on the N57, it is concealed behind the intake pipe, making it less noticeable than on the N47. You must relocate that pipe to access it.

Always good when someone comes back with an update. Hope it all goes smoothly.

One thing I always suggest is asking if you can view the vehicle in person if a company refuses or gets defensive that’s when alarm bells ring. If they’re open to visits or even collection, it generally means they’ve got nothing to hide.

1. Boost leak / charge air leak An improperly secured clamp or misaligned hose after the filter box. Fractured intercooler tubing (prevalent in M47/E60 models). Damaged intercooler. This would also explain the exhaust odor—if the leak is close to the engine compartment, heated boost/exhaust vapors m...