David,

Yes, I do have a code reader.

Your idea sounds like it's worth a try. Just one things bugs me - the local auto parts store only sells noid lights in a backage of about 8, for brands I don't own, and I don't want to spend $30 for what's basically a light bulb I'd probably only use once in my life. So, do you (or anyone else) have any idea what wattage bulb I could use as a substitute for an actual noid light? I tried using a 21W tail light bulb on a known good connector, and it didn't light up. Anybody have a guess as to how much current (I erroneously said voltage in my most recent post) the injector signal puts out? The 21W bulb draws over 1.5 amps, which I should have realized is way too much. Thanks.

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2003 X5 4.4i
1992 Porsche 968
2007 328i
2014 Subaru Forester XT