"something about using an additive"? The check engine light will not set from using an additive, it is likely a fuel mixture type situation in the order of lean mixture or rich mixture at idle. Adaptive values to a BMW is the fuel trim at idle. If the fault was adaptive mixture too lean, it is caused by unmetered air in the form of a vacuum leak or torn intake boot.

And by the way, the OBDII reader will do nothing with the brake pads warning, after the pads and sensor are changed you simply need to turn the key on leaving engine off for about a minute and it resets during a system check.

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X5 pics

RIP 4.6is.....

2003 4.6is