Hopefully you up graded the plugs installed.
2.5/2.8/3.0
Iridium IX Part No. BKR6EIX, Stock No 6418, Plug gap .032”

spark plug connectors are BERU brand..if so they are per the spec noted below...1.8Kohm +/- 20%.

Coils should be .8 ohms between pin 1 and 15 (outer pins)...try a lower ohm setting on your multimeter and read them again, but these too seem to be in spec. limits.

Bad ignition coils will give you a SES light. The SES light / OBDII code will point right to the bad one.

Start with ensuring power to your ignition connector - pin 15 should have 12 volts...not fused so be careful while probing.

to test ignition coil primary resistance you can probe terminal 1 (-) and 15 (+)..and you should read approx 0.8 ohms.

to test spark plug connector resistance the Bosch should read 1Kohm +/-20%.
BERU brand should read 1.8K ohm resistance.

Ref. section 120 of Bentley's manual...pin one and 15 are the two outer pins of the three prong connector..4A is the middle pin

Replace the plug boots as they are just a short plug wire that lives in one hot area. You do have the old style square coils correct?

Attached Images

     

__________________

2005 X5 4.8IS
The Blue ones are always FASTER....

Current Garage:
2005 X5 4.8is
2002 M5 TiSilver
2003 525iT
1998 528i
Former Garage Stable Highlights
2004 325XiT Sport
1973 De Tomaso Pantera, L Model
1970 Dodge Challenger T/A 4 sp Alpine White
1970 Dodge Challenger T/A 4 sp GoManGo Green
1971 Dart Sport, “Dart Light” package
1969 Road Runner 383
1968 Ply Barracuda 340S FB Sea-foam Green