OFFROADSUBARUS.COM

Go Back   OFFROADSUBARUS.COM > Technical Forums > General Troubleshooting and Technical Help

Notices

Reply
Thread Tools Display Modes
  #1  
Unread 16th November 2016, 07:03 PM
daniel glavin's Avatar
daniel glavin daniel glavin is offline
Forum Member
 
Join Date: May 2016
Location: portland, oregon
Year: 2002
Model: Outback
Transmission: Auto
Posts: 58
daniel glavin is on a distinguished road
Default Advice for engine code P0420

Hey everyone,

So I was heading back down from the mountains yesterday and I noticed my check engine light popped on. I went to the local shop and got the code read and bam it's a P0420 and they're recommending I replace the Catalytic Converter. Here is the issue i'm having:
I've read up on it a bit and everyone on other forums is saying that usually this is complete crap with this gen specifically (2002 Subaru Outback) and that most likely all I need to do is change the front oxygen sensor or maybe not even that.

Does anyone have any experience with this? My Subie only has 109,000 miles on it and my understanding is that catalytic converters need replacing very rarely.

Any suggestions are well come,

Thanks.
Reply With Quote
  #2  
Unread 16th November 2016, 11:02 PM
Kevin's Avatar
Kevin Kevin is offline
Administrator
 
Join Date: Jul 2008
Location: Sydney, Oz
Year: MY'03
Model: Forester
Transmission: A/T
Posts: 4,520
Kevin is on a distinguished road
Default

Is the car performing OK? I think more tests would be required before anyone can say it's the cat; there is some guidance here that may be of value: https://www.obd-codes.com/p0420
__________________
MY'03 Foz AT XS with centre lock-up
MY'10 Triton AT GLX-R 2.5 DiD
www.subaruclub.com.au
Reply With Quote
  #3  
Unread 16th November 2016, 11:29 PM
daniel glavin's Avatar
daniel glavin daniel glavin is offline
Forum Member
 
Join Date: May 2016
Location: portland, oregon
Year: 2002
Model: Outback
Transmission: Auto
Posts: 58
daniel glavin is on a distinguished road
Default

Yeah it's running just as fantastic as before. I haven't noticed any differences. Thanks for the link.
Reply With Quote
  #4  
Unread 17th November 2016, 02:22 AM
Kevin's Avatar
Kevin Kevin is offline
Administrator
 
Join Date: Jul 2008
Location: Sydney, Oz
Year: MY'03
Model: Forester
Transmission: A/T
Posts: 4,520
Kevin is on a distinguished road
Default

When my front o2 sensor failed the car ran like a 2 legged dog and fuel usage went through the roof. Have you tried to clear the code and then see what happens?

Reset ECU here: http://www.offroadsubarus.com/showthread.php?t=4607
__________________
MY'03 Foz AT XS with centre lock-up
MY'10 Triton AT GLX-R 2.5 DiD
www.subaruclub.com.au
Reply With Quote
  #5  
Unread 17th November 2016, 01:50 PM
daniel glavin's Avatar
daniel glavin daniel glavin is offline
Forum Member
 
Join Date: May 2016
Location: portland, oregon
Year: 2002
Model: Outback
Transmission: Auto
Posts: 58
daniel glavin is on a distinguished road
Default

Alright man thanks. I do this asap. Any reason why the check engine light would just pop on though? Just happens sometimes, or does the P0420 code have a list of things that it could mean besides the cat/sensor?

Thanks.
Reply With Quote
  #6  
Unread 17th November 2016, 01:53 PM
daniel glavin's Avatar
daniel glavin daniel glavin is offline
Forum Member
 
Join Date: May 2016
Location: portland, oregon
Year: 2002
Model: Outback
Transmission: Auto
Posts: 58
daniel glavin is on a distinguished road
Default

Oh and I just read that first link you sent me and it answered those questions. Thanks a lot Kevin.
Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT -3. The time now is 02:36 PM.


Powered by vBulletin®
Copyright ©2000 - 2018, Jelsoft Enterprises Ltd.