99% an ignitor issue. I'd try swapping ignitor from left to right.
You can replace the ignitor individually with an OEM peice, or replace the ballast/ignitor assembly with an aftermarket one that will be PnP into your D2S housing.
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2002 TiAg M3 6mt
deoranged, dechromed, led tails, ZHP knob, UUC SS v3, GROM, OEM 220M 19's, Michelin Supersports
2006 YZF-R6, bunch of go-fast stuff