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post #1 of 16 (permalink) Old 05-25-2013, 08:42 PM Thread Starter
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Question Some One Gimmie Some Info...

Well I have all new exhaust from badmab header to exhaust and I changed my bank 1 o2 sensor but its still giving my the code p0420 ..I done reset it. Brand new dp. And o2 sensor I got from the auto warehouse.. guy told me when I start it up it clicks for about 30 seconds on a cold warm up cause oil is warming up and then stops and he said that coild be cause it to throw the code...any one else with the issue???
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post #2 of 16 (permalink) Old 05-25-2013, 08:50 PM
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Well I have all new exhaust from badmab header to exhaust and I changed my bank 1 o2 sensor but its still giving my the code p0420 ..I done reset it. Brand new dp. And o2 sensor I got from the auto warehouse.. guy told me when I start it up it clicks for about 30 seconds on a cold warm up cause oil is warming up and then stops and he said that coild be cause it to throw the code...any one else with the issue???
Only 1 bank of HO2s on a 4 cylinder. 1 upstream heated oxygen sensor and one downstream heated oxygen sensor.(1 before cat and 1 after cat) P420 is normal if you installed new cat. Here is note from GM server.

From service manual:

Circuit/System Description

Important: A new converter with less than 100 miles on it may set DTC P0420 due to out-gassing of the internal matting. Operating the vehicle at highway speeds for approximately 1 hour may correct the condition.

A 3-way catalytic converter (TWC) controls emissions by converting hydrocarbons (HC) and carbon monoxide (CO) into carbon dioxide (CO2), and oxides of nitrogen (NOx) into nitrogen. The TWC also stores oxygen. When the listed driving conditions are met, the Catalyst System Efficiency test will run. The powertrain control module (PCM) monitors this oxygen storage capacity by comparing the pre and post-catalyst oxygen sensor signals while adding and subtracting fuel during specific driving conditions. The PCM compares the pre and post-catalyst oxygen sensor signals to determine if the oxygen storage capacity of the catalyst is degraded.

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post #3 of 16 (permalink) Old 05-25-2013, 08:55 PM Thread Starter
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Ok thank god it was normal I was like for real with this issue ..
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post #4 of 16 (permalink) Old 05-25-2013, 09:15 PM
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Ok thank god it was normal I was like for real with this issue ..
I had the same code for 3 trips when I first got mine. It will trigger the cat converter to read low signal, meaning its supposed to toggle between rich/lean 5 times per second (normal), the increased Hydrocarbons HC, Carbon Monoxide CO, and Nitrous Oxide (NOx not NOS, meaning Nitrous and Oxygen with unknown number of oxygens) flowing through the exhaust piping and having your catalyst breakdown all them chemicals into CO2 out the tailpipe (good).

The increased flow and having a huge exhaust collector (big tube where all the cylinder ports meet) will cause it, but your PCM will pickup a learn mode for that function, but it takes at least 2 trips of a driving cycle for it to achieve that.

Sounds more complicated above, but it will default to normal after a few driving sessions.

2009 Cobalt LS XFE U74
Mods: K&N Typhoon Intake, Option Cat-Back Exhaust, Cosmo Short shifter, Maxxim Ahead 17X7's, MPx shorty antenna, FE5 Strut/shocks, Tein S Techs, Moog endlinks, Moog spring seaters, ZZP shorty header, LSJ downpipe, LNF front grille
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post #5 of 16 (permalink) Old 05-25-2013, 09:25 PM Thread Starter
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How long is a session? I see 1 hour on highway now is that one trip cause I drive my car every day for about 15 mins for work and 30 if I go place but not highway??

---------- Post added at 11:25 PM ---------- Previous post was at 11:18 PM ----------

Hey stealth you have aftermarket exhaust system meaning header dp and all?
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post #6 of 16 (permalink) Old 05-25-2013, 09:35 PM
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A trip has to have enabled criteria, meaning your emissions have completed a drive cycle. Evap system, closed loop achieved on 02 sensors, ECT (Engine coolant temp sensor) has achieved normal temp (195 degrees Fahrenheit), stuff like that, 1 hour on the highway would be about right, but some vehicles require city driving, stopping, etc. It just depends on our PCM, we cant significantly tell if its trip A or B.

Your P0420 should disappear after a few days-week, try resetting the DTC at Autozone or a Scan Tool. If not, your catalyst converter maybe in danger.

I just have a shorty header and catback, stock downpipe and cat. My new header from Badmab Industries had that issue for 3 days. It was reset when I got a dyno tune.

2009 Cobalt LS XFE U74
Mods: K&N Typhoon Intake, Option Cat-Back Exhaust, Cosmo Short shifter, Maxxim Ahead 17X7's, MPx shorty antenna, FE5 Strut/shocks, Tein S Techs, Moog endlinks, Moog spring seaters, ZZP shorty header, LSJ downpipe, LNF front grille
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post #7 of 16 (permalink) Old 05-25-2013, 09:38 PM Thread Starter
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Oh I have zzp dp great I just put the new o2 sensor in yesterday and had my dp in for couple weeks now...does that rule apply to aftermarket dp
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post #8 of 16 (permalink) Old 05-25-2013, 09:40 PM
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well, is your dp catted?

2009 Cobalt LS XFE U74
Mods: K&N Typhoon Intake, Option Cat-Back Exhaust, Cosmo Short shifter, Maxxim Ahead 17X7's, MPx shorty antenna, FE5 Strut/shocks, Tein S Techs, Moog endlinks, Moog spring seaters, ZZP shorty header, LSJ downpipe, LNF front grille
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post #9 of 16 (permalink) Old 05-25-2013, 09:42 PM Thread Starter
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Yes sir for emissions

---------- Post added at 11:42 PM ---------- Previous post was at 11:42 PM ----------

But I didnt get the header put on til last saturday
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post #10 of 16 (permalink) Old 05-25-2013, 09:45 PM
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did you get the right 02 sensors? should be H02 (Heated 02 sensor) for Bank 1 sensor 1 on header, then H02 for Bank 2 sensor 1 (post-after cat). If it triggered right after the 02 installation, you either got the wrong ones, cheapos, or its detecting too rich or lean, which will throw a DTC code.

You may need to on the first 02 sensor on the header, add a spark plug anti fouler old trick for it to space out just enough for the proper readings.

Overall, use exactly what GM uses for 02's, never bosch or parts.something.com's.

Coby7 is dead on right for a TWC (Three Way Catalyst). It is used OEM on our vehicles, since we no longer require EGR valves, we use Variable Valve Timing or High Compression Pistons. You can thank the EPA for that one. You may have a faulty catalyst as well, being aftermarket, though I hear that no one has any issues with ZZP downpipes.

2009 Cobalt LS XFE U74
Mods: K&N Typhoon Intake, Option Cat-Back Exhaust, Cosmo Short shifter, Maxxim Ahead 17X7's, MPx shorty antenna, FE5 Strut/shocks, Tein S Techs, Moog endlinks, Moog spring seaters, ZZP shorty header, LSJ downpipe, LNF front grille

Last edited by 5t3alth; 05-25-2013 at 09:52 PM.
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