Thread: P0420 Catalyst System Efficiency Below Threshold
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Old 12 June 2010, 12:03 AM
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r1c
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Hi, A cat efficiency code will generally tell you your cat is fupared. But as say you are running a decat system. How long have you been de catted. ? Have you been mapped?? Can you tell us a bit more about your car, what mods etc?
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