ECU : PO420 = Catalyst Efficiency Below Threshhold. From bank #1
#1
ECU : PO420 = Catalyst Efficiency Below Threshhold. From bank #1
Hey guys........I just updated my car with a new timing belt, water pump, plugs, wires, and dist., now afterwards I get the trouble code 420. No codes before my updates. The car runs stronger then ever but when I reset the code within a day of so the code comes back on. I have a 1996 Accord EX with 125k, 2.2 Vtec.
If my cat. is bad will that affect anything else, ie. gas mileage, motor? Or can I just drive it with no effects besides the engine light being on for code 420?
I live in Il. and no smog testing or any issue like that.
If I should replace it, does everyone buy a used one from the salvage yard or are there new ones that are affordable.
Thanks in advance for your answers.....
Anthony
If my cat. is bad will that affect anything else, ie. gas mileage, motor? Or can I just drive it with no effects besides the engine light being on for code 420?
I live in Il. and no smog testing or any issue like that.
If I should replace it, does everyone buy a used one from the salvage yard or are there new ones that are affordable.
Thanks in advance for your answers.....
Anthony
#2
Honda-Tech Member
Re: ECU : PO420 = Catalyst Efficiency Below Threshhold. From bank #1
i believe when the CEL comes on the ecu has a safety feature and make the car run rich ... which will effect performance and gas mileage ... oem cat. cost an arm and a leg ... and an eye lol ... if you can find one at the junk yard that works and can get it for cheap i'd try that first ...
#3
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Re: ECU : PO420 = Catalyst Efficiency Below Threshhold. From bank #1
I get the same code on my 97 running an h22 with no cat. I just starting getting this code not to long ago and the car hasn't had a cat since 2001.
but yeah my car is running like crap when the code comes on.
My fix, OBD1 conversion. not a solution for you though. Sorry cant help besides you getting a cat.
but yeah my car is running like crap when the code comes on.
My fix, OBD1 conversion. not a solution for you though. Sorry cant help besides you getting a cat.
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