PO420 - catalyst efficiency?
Registered User
Thread Starter
Join Date: Oct 2003
Posts: 96
Likes: 0
Received 0 Likes
on
0 Posts
PO420 - catalyst efficiency?
my car is putting out code "P0420" Catalyst System Efficiency Below Threshold (Bank 1) ,--- its actually pulling 2 codes, but they're both the same code -----now i tried resetting it but it goes back on after 20 miles... I dont have any cats so im not worried, but is the car actually slower now that its in "limp" mode? I do have the cel fix but it doesnt seem to stop it... any ideas? is fuel economy affected as well?
I am catless, and seems like the light came on after i installed teh boost contrller... should i b worried? i dont see the connection of adding teh mbc with this code lightin up... and yea i do have that resistor that came with the helix pipe... arrgghh im a lil confused here
I am catless, and seems like the light came on after i installed teh boost contrller... should i b worried? i dont see the connection of adding teh mbc with this code lightin up... and yea i do have that resistor that came with the helix pipe... arrgghh im a lil confused here
4x4
Join Date: Jul 2003
Posts: 523
Likes: 0
Received 0 Likes
on
0 Posts
no WRX dont really have a "safe" moad...they do but it doesnt effect its performance...from what i know it doesnt...with no cats CELS are very comon it doesnt seem to be anything wrong with the car...just pointless CELs...take it to mastro if u cant fix it and see what they say but they prollly say "oh what u dont have cats that will hurt your car"...the usual BS
__________________
Guest
Posts: n/a
The car does have a "limp mode" but the codes you are throwing aren't going to cause you to end up there. I'm surprised the resistor didn't help with the CEL; did you put it in the correct spot? It should be spliced inline on the rear O2. If it really isn't working you could always try the one that Mastro sells, it's been working great for me and I haven't throw a related code since installing it. Other then that it isn't anything to worry about, the code is just letting you know that you are polluting the environment.
1337 H4x0r
Join Date: Mar 2002
Posts: 900
Likes: 0
Received 0 Likes
on
0 Posts
What model year is your WRX? The '02-'03 0420 CEL fix isn't compatable with the '04s and vise vera. I had really good luck with the Pony Express fix on my '02. I haven't tried the '04 solution yet but I haven't heard anything negative regarding these.
2002-03: http://www.ponyexpressperformance.co...liminator.html
2004: http://www.ponyexpressperformance.co...liminator.html
2002-03: http://www.ponyexpressperformance.co...liminator.html
2004: http://www.ponyexpressperformance.co...liminator.html
1337 H4x0r
Join Date: Mar 2002
Posts: 900
Likes: 0
Received 0 Likes
on
0 Posts
Originally posted by Skeet
hey Istepnio have u started to mod the STi yet?
hey Istepnio have u started to mod the STi yet?
I'm waiting on engine management to be available before I start messing with things and even when that happens I'll just be installing a downpipe.
Registered User
Thread Starter
Join Date: Oct 2003
Posts: 96
Likes: 0
Received 0 Likes
on
0 Posts
I do have the resistor that came with the helix combo up/downpipe from gruppe-s, and it seemed to work fine for about 3 weeks.... but then when i added the boost controller, it came on after about 20 miles of very non-aggressive driving.. "granny style" resetted it and it would go back on after a while -- oh well, im guessin da resistor got fried, fell out, or somethin, if not, i think i'm gonna go ahead and try that one from pony express.. thanks for the tip guys
