I would get cel/SES occasionally with mine, it would usually happen at start and then the limo mode stayed until I reset it. Happened about 3 times over a year.

Then wife's started to do it but much more regularly but when code was on one cylinder regularly I went to swap coil packs to see if the trouble migrate but I pulled the plug at the same time it was horrible after less than 30,000 mi.

I swapped her plugs back to OE brand and problem vaporized.

Spark fuel air that's as simple as it gets. It's nearly impossible to get a misfire from air problem just lean/rich codes so misfire is almost always fuel or spark. Clean/swap coil or injector to see if a problem cylinder will migrate to a different cylinder and make sure your fuel pressure maintains under heavy throttle.

The computer does not keep track of fuel pressure it assumes it's always exactly 50psi. It meters the fuel using milliseconds of injector timing and will use the wrong amount of fuel if the pressure is other than 50psi.

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2011 E70 • N55 (me)
2012 E70 • N63 (wife)