P0420 Error after Cold Air Intake install
07-06-2014, 11:13 PM
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P0420 Error after Cold Air Intake install I just installed a cold air intake on my LSX, and I had this below threshold catalyst P0420 error came up. The MAS is pointed the right way, everything seems tight, the wire is plugged into the MAS all the way. The code popped up after 30 miles of driving. 90K on the vehicle, automatic, no exhaust mods, premium fuel from Chevron or Shell only. No other codes ever. Any thoughts? Coincidence or bad install?
