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11-09-2020, 08:52 AM | #1 |
Scooby Newbie
Member#: 465803
Join Date: Apr 2017
Chapter/Region:
Tri-State
Vehicle:2004 Wrx White |
Po420 2004 Subaru wrx
kinda stumped guys maybe I can get some input. I have a po420 code I had the code read and it said it was bank 1. I replaced bank 1 o2 sensor with a oem denso. After about 25 miles the light popped back on. The car is completely stock except for a grimmspeed up pipe. I do have a hole I noticed yesterday after the second 02 sensor. The car has a 149k for miles. Is it common for cat in the down pipe to go bad? Any help is appreciated
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11-10-2020, 09:47 AM | #2 |
Scooby Guru
Member#: 21145
Join Date: Jul 2002
Chapter/Region:
NESIC
Location: Not in my own time
Vehicle:2002 Enemy of Aku |
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11-10-2020, 06:20 PM | #3 |
Scooby Newbie
Member#: 465803
Join Date: Apr 2017
Chapter/Region:
Tri-State
Vehicle:2004 Wrx White |
I have a hole in the exhaust right after the cat with bank 2 02 sensor. If I replace the exhaust which I have ordered with a stock Walker. What is my option if the cat is plugged in the downpipe?
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11-10-2020, 06:55 PM | #4 | |
Scooby Newbie
Member#: 337836
Join Date: Nov 2012
Chapter/Region:
NESIC
Location: Connecticut
Vehicle:2002 WRX Wagon Aspen White |
Quote:
You changed your front o2 which does not output anything that has anything to do with P0420. Your front o2 is for closed loop fueling, nothing to do with catalyst efficiency, AKA P0420. If your cat was plugged in the downpipe your car would run like ****. Change your rear O2, or buy a tactrix and disable P0420 like the rest of us. |
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11-10-2020, 06:57 PM | #5 |
Scooby Newbie
Member#: 337836
Join Date: Nov 2012
Chapter/Region:
NESIC
Location: Connecticut
Vehicle:2002 WRX Wagon Aspen White |
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11-11-2020, 08:40 AM | #6 | |
Scooby Guru
Member#: 21145
Join Date: Jul 2002
Chapter/Region:
NESIC
Location: Not in my own time
Vehicle:2002 Enemy of Aku |
Quote:
His DP may not be plugged, but the cat could be starting to decay, which may be causing an issue. Simply shutting off a CEL is never the correct answer UNLESS you know for certain the code is false. How old is this DP you have installed? The car may have 149K on it but what about the DP? |
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11-11-2020, 09:07 AM | #7 |
Scooby Newbie
Member#: 465803
Join Date: Apr 2017
Chapter/Region:
Tri-State
Vehicle:2004 Wrx White |
The down pipe is as old as the car I believe I bought the car in 2016 the car was stock I had a uppipe installed by a Subaru mechanic. So I assume its as old as the car is
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11-12-2020, 10:26 AM | #8 |
Scooby Guru
Member#: 21145
Join Date: Jul 2002
Chapter/Region:
NESIC
Location: Not in my own time
Vehicle:2002 Enemy of Aku |
The Grimmspeed UP is really nothing more than a pipe. There is no cat involved so no potential of a cat disintegrating.
But since you are talking an Rear O2 sensor, the UP has nothing to do with that. I presume you have the stock DP. As said before, YES, a cat can go bad and be causing your issues. You can't tell by looking at the DP if the cat is bad or not. You are going to have to remove the DP and inspect internally. Grimmspeed makes very nice catted DPs. I highly doubt the hole in the exhaust AFTER the cat / O2 Sensor is causing any issue since the O2 Sensor has already done it's job. |
11-13-2020, 12:03 PM | #9 |
Scooby Newbie
Member#: 337836
Join Date: Nov 2012
Chapter/Region:
NESIC
Location: Connecticut
Vehicle:2002 WRX Wagon Aspen White |
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