i recently installed the k-series reflash and had the error code P0420: catalyst system efficiency below threshhold pop up
i also discovered that my car is running rich by checking the spark plugs and i know that 02-04 rsx already do run rich but i dont think this is supposed to set off an error code.
so my question is how can i correct this or is this expected?
i have an 2004 rsx type s with a cai
i reset the code and so far it hasnt popped up under normal driving conditions so im thinking that its only triggered in higher rpms maybe around the new vtec point
I looked up what to do under a P0420 code in the helms manual but you need the scan tool to do the check and I dont have one
but when i took my car to my mechanic he said the code is most likely caused by the car running too rich.