20gst
20+ Year Contributor
- 174
- 0
- Jan 5, 2003
-
Colorado_Springs_Colorado
Ok this code keeps poppin on me lately.
P0420 def; catalist system efficiency below threshold (bank 1)
Ive changed both o2 sensors last week and up comes the light again. I erased it but no luck. I have 3'' down pipe to 3'' high flow to an N1 w/no resonater between. My 3'' stuff is all about 1 year fresh. What could cause this code ?
Is it possable I burned the cat up. It dont smell or make noise, I dont notice any different changes in the car in performance. I dont get it ? Anyone dealt with this before.
P0420 def; catalist system efficiency below threshold (bank 1)
Ive changed both o2 sensors last week and up comes the light again. I erased it but no luck. I have 3'' down pipe to 3'' high flow to an N1 w/no resonater between. My 3'' stuff is all about 1 year fresh. What could cause this code ?
Is it possable I burned the cat up. It dont smell or make noise, I dont notice any different changes in the car in performance. I dont get it ? Anyone dealt with this before.