Aftermarket Cat & code P0420
#1
Aftermarket Cat & code P0420
Is this the same code everyone gets intermittently when they have a aftermarket cat? CEL came on last night. 1st time. Code is P0420. Catalyst system efficiency below threshold. Or is it o2 related?
I cleared it & hasn't come back. Been running the RT cat for a year now no problems.
I cleared it & hasn't come back. Been running the RT cat for a year now no problems.
#6
Told Ya'LL...DYNASTY !!
iTrader: (2)
I just had to deal with this so I could get an inspection... Basically you jus need to get a defouler, a 90 degree one works best because of limited space... Basically the ecu is reading the increased flow from the high flow cat as the stock cat going bad causing it to throw a false code.. I finally put the defouler on and have been code free for 300+ miles
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#9
Whats up with RDX owners?
iTrader: (9)
I had that intermittently as well. I picked up a defouler, it went away, then the defouler broke (long story) so now I run without it. No CEL in 2-3k miles
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