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Well I have the same problem (P0171) on R18 with K&N Typhoon... basically just comes on once a week or every two weeks, stays on for a couple of days and goes away on its own. Reseating the battery cable works too, but gets old after about 5 times. Had dealership reprogram ECM/PCM today, if that doesn't work (and it comes back on) they tell me I'll have to put it back to stock or it won't be covered under warranty.
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