This is what I do...
- Removed the cosmetic cover and saved it on the garage shelf.
- Bought a few used OEM ignition coils on ebay (or junk yard), marked them with white paint so I know these are spare, and test them in the car beforehand.
- Then save them in the trunk for long trips.
- Also carry a basic Code Reader (such as Maxi 300, about $15 on amazon).
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1998 E39 528i 5sp MT
2006 E53 X5 3.0 6sp MT
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