Hello All,
So this 07 Axela shows up an engine fault code on coil pack 1 (engine running ok). Probably intermittent. Dealer wants over $1000 for a new genuine set (I ask for a set, cos I gather that if 1 goes its likely several may go).
I fitted a replacement aftermarket set that look very similar, same part number, but the resistance measurements seem a little different to the originals, and they are now triggering fault codes (tho the engine seems to run fine) pointing to all the coils.
My question: if I can find units with resistance measurements the same as the old ones (as per below) and they fit properly, should that fix the fault code?

The process I have followed so far:
1) I fit 1 identical looking aftermarket coil (same part numbers, same ZY-VE engine) and a set of new sparkplugs to the faulting coil (no. 1). but engine fault comes back.
2) So I fit other 3 replacement aftermarket coils. The engine fault is now all 4 coil fault codes (Engine is still running fine through all of this). I take this fault to mean that the internals of the aftermarket coil are not quite compatible with the ecu, but they still work.
3) I measure resistance across the 3 terminals for all the original coils; for terminals numbered left to right, 1-2 are 1.47k-ohm, and 2-3 are 9.55mega-ohm. 2-3 only measures one way which means they have a diode. Im guessing the first measure is the primary and the second the secondary circuits.
4) But, the same measurement on the new replacement coils 2-3 yields about 12m-ohm. The conventional method of measuring the plug terminal does not give a reading for any coil

Thanks for any ideas, people