engine code

bryan213 · 07-22-2009, 12:24 AM

ok i give up on magnaflow ima kill my car just about to just give up and sell it... i have a magnaflow catt on my car and keep getting engine light for catt efficenty.... top and lower 02s are brand new idk what eles it could be im having no other codes at all..... is thare a way to trick the computer or could i get a computer for my car that will relize that it has a high flow catt.. its a 03 v6 3.4l any help will be welcomed...

Redog · 07-22-2009, 12:37 AM

The downstream O2 will not read correctly on anything other than a factory GM cat.

Get an O2 simulator for the downstream, or a PCM reprogram to delete it, that's the only way to get rid of the P0420 you're getting

PFYC.com used to sell one, I don't know who does anymore

Actually the Government and the EPA shut that part of Casper down. Maybe the "resistor" trick will work

Redog · 07-22-2009, 12:53 AM

Here you go!!

http://www.afterthoughtsauto.com/o2sim.html

We have either 1,3,or 4

bryan213 · 07-22-2009, 01:16 AM

if i get a tuned pcm will i fail emmisions?

bryan213 · 07-22-2009, 01:32 AM

has anyone had experience with a tuned pcm ???

jackal2000 · 07-22-2009, 06:18 AM

the only way you will fail emissions is if the cat is actually bad and that depends on the type of emissions check they do, tail pipe sniffer or OBDII.

[ion] C2 · 07-22-2009, 07:25 AM

Borrow HPTuners and disable that code.. it's not an important code at all...

Redog · 07-22-2009, 08:55 AM

Quote:

Originally Posted by bryan213

if i get a tuned pcm will i fail emmisions?

Nope, had a tuned PCM for years now and my car passes, and that's here. SE PA emissions are only 2nd to Cali emissions

Alerosaint · 07-22-2009, 10:02 AM

Quote:

Originally Posted by [ion] C2

Borrow HPTuners and disable that code.. it's not an important code at all...

I need to disable that code myself....do you know off hand how to disable it???

[ion] C2 · 07-22-2009, 10:06 AM

Open the VCM Editor. Go to Engine Diag-->DTCs.

Go to P0420, uncheck SES Enable. Click on the Error Mode and change it to 3 - No Error Reported.

Alerosaint · 07-22-2009, 10:09 AM

ahhhhh...thank ya

Psyfox · 07-22-2009, 08:06 PM

Quote:

Originally Posted by jackal2000

the only way you will fail emissions is if the cat is actually bad and that depends on the type of emissions check they do, tail pipe sniffer or OBDII.

Lucky...not in Missouri. If you replace the cat period you fail emissions.

[ion] C2 · 07-22-2009, 09:08 PM

If you replace the cat when it fails it's legal.... and for an OBD-II compliant catalyst.

bryan213 · 07-23-2009, 12:48 AM

wat company sells pcms for aleros that i should trust

[ion] C2 · 07-23-2009, 08:37 AM

HPTuners and tune it for your vehicle specifically. No mail order tune will do a good job on your specific vehicle.

bryan213 · 07-23-2009, 05:26 PM

yea im thinking about just buying the program and everything but 500 bucks ouch lol now will i be able to do the electric shift kit just like the pcms that you can buy

[ion] C2 · 07-23-2009, 05:26 PM

You do a lot better than any "shift kit" when you edit the computer with HPtuners.

Psyfox · 07-23-2009, 05:35 PM

Quote:

Originally Posted by [ion] C2

If you replace the cat when it fails it's legal.... and for an OBD-II compliant catalyst.

So then my question to you is how do you induce failure? :P ... I'd love a high flow cat. ...damn legalities.

[ion] C2 · 07-23-2009, 05:58 PM

Dude just replace your cat. High flow ones are typically illegal anyway because they don't convert as well as regular ones. As long as the cat is OBD-II compliant and whatever, it's legal. In California it has to be CARB exempt.

heineck · 07-23-2009, 06:00 PM

no shit... $300 for sumthin thats not even high flow. u can get a high flow for half that price damn CARB