Forum civicx si P0139 error Forum cel 0l fixing downpipe install after civicx wire so slack sensor partially o2 ll left much also there add
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P0139 help
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bomber si coupe | 2016+ Honda Civic Forum (10th Gen) - Type R Forum, Si
Fixing P0139 CEL after Downpipe Install - 2.0L | 2016+ Honda Civic