P0420/p0430
Thread Starter
TECH Apprentice
Joined: Oct 2007
Posts: 311
Likes: 4
P0420/p0430 What's up you guys, I recently changed out some oem catalytic converters to new high flow types and I'm hoping to get some guidance on removing these codes stated in the header that pops up regularly since the change out. I'm using up tuners and can't seem to find out how to remove them. Any advice is welcomed. Thanks
Thread Starter
TECH Apprentice
Joined: Oct 2007
Posts: 311
Likes: 4
ok so I think I figured it out, I went into the DTC in HP tuners edit and unchecked the ses enable for the P0420/P0430. but I noticed that the car was unusually thirsty. this is on a 2007 cts-v, any ideas?
TECH Fanatic
Joined: Oct 2014
Posts: 1,220
Likes: 179
From: Virginia
You might have a CAT overtemp problem, as in the engine will run very rich to cool the cats off. It would explain your fuel consumption issue.
Typically this is caused by the rear O2 sensors, which you could disable in the tune, or find the appropriate sensors for those cats. The computer is probably seeing numbers from them that it's not used to seeing with your new high flow ones.
I don't have any on my car, but hopefully this can get you pointed the right direction.
Typically this is caused by the rear O2 sensors, which you could disable in the tune, or find the appropriate sensors for those cats. The computer is probably seeing numbers from them that it's not used to seeing with your new high flow ones.
I don't have any on my car, but hopefully this can get you pointed the right direction.
Thread Starter
TECH Apprentice
Joined: Oct 2007
Posts: 311
Likes: 4
Thanks I will try this soon. But I made some adjustment with the ECT and maxxed it out to 4hundred something. So far it hasn't popped up and cars running ok. Aside from some odd vibrations that's is most likely not related to the high flow cars
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Thread Starter
TECH Apprentice
Joined: Oct 2007
Posts: 311
Likes: 4
You might have a CAT overtemp problem, as in the engine will run very rich to cool the cats off. It would explain your fuel consumption issue.
Typically this is caused by the rear O2 sensors, which you could disable in the tune, or find the appropriate sensors for those cats. The computer is probably seeing numbers from them that it's not used to seeing with your new high flow ones.
I don't have any on my car, but hopefully this can get you pointed the right direction.
Typically this is caused by the rear O2 sensors, which you could disable in the tune, or find the appropriate sensors for those cats. The computer is probably seeing numbers from them that it's not used to seeing with your new high flow ones.
I don't have any on my car, but hopefully this can get you pointed the right direction.
Last edited by oxblood!z28; Jul 3, 2018 at 08:36 PM.
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