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Old 04-03-2014, 09:04 PM   #945
steve99
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Join Date: Dec 2013
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Quote:
Originally Posted by Mirko View Post
Guys a CEL just appeared on the dash while driving to a car meet. The oft says p0420 which is the "Catalyst System Efficiency Below Threshold" fault code.
I have been running jdl uel headers and stage 2 uel for almost a week and 600 kms with no issues... any suggestions? (European car and tune, 6MT)
Assume you have catless headers ? if so go into ROMRAIDER and disable the CEL code
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