Code P0430
Thread Starter
Racer
Joined: Apr 2005
Posts: 351
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From: Louisville Kentucky
Code P0430
I have a C6, Z51 6-speed with long-tube headers (Dynatech) with high-flow cats. I have had them for about 6,000 miles with no codes (after the first week). The car runs perfectly. I have a code "P0430 Catalytic system efficiency below threshold (Bank 2)." This was not one of my first week codes. The Chevy dealer said that it is probably a bad O2 sensor on the driver's side behind the cat. He said that it may also be the wire. Have any of you had this? What did you do? Thanks for the help.
Race Director
Joined: Mar 2005
Posts: 11,549
Likes: 27
From: Southampton NJ
Originally Posted by VetteNo2
I have a C6, Z51 6-speed with long-tube headers (Dynatech) with high-flow cats. I have had them for about 6,000 miles with no codes (after the first week). The car runs perfectly. I have a code "P0430 Catalytic system efficiency below threshold (Bank 2)." This was not one of my first week codes. The Chevy dealer said that it is probably a bad O2 sensor on the driver's side behind the cat. He said that it may also be the wire. Have any of you had this? What did you do? Thanks for the help.
Race Director
Joined: Jan 2005
Posts: 10,924
Likes: 854
From: Daytona Beach FL
Originally Posted by VetteNo2
I have a C6, Z51 6-speed with long-tube headers (Dynatech) with high-flow cats. I have had them for about 6,000 miles with no codes (after the first week). The car runs perfectly. I have a code "P0430 Catalytic system efficiency below threshold (Bank 2)." This was not one of my first week codes. The Chevy dealer said that it is probably a bad O2 sensor on the driver's side behind the cat. He said that it may also be the wire. Have any of you had this? What did you do? Thanks for the help.
Did you do anything to your tune recently?
If you have a Predator and put in the factory tune prior to a visit to the dealer, just put your custom tune back in and you'll be fine. We had another forum member that had this same code recently and that was his problem.
If you don't have a tune, you might consider getting one. It will take care of this problem and really wake up the car and take advantage of your mods. At least on my car with Kooks and high-flow cats, even my Predator "custom" tune (which is nothing like a full-blown custom dyno tune) really perked my car up. A tune is a good thing.
Bob
Thread Starter
Racer
Joined: Apr 2005
Posts: 351
Likes: 0
From: Louisville Kentucky
I did have a tune the weekend before last on Saturday. I also had a Honker and a FAST intake manifold installed on Thursday and Friday, respectively, but this problem showed up 8 days and over 150 miles later. As I said the car runs great. It has a lot more power, sounds better and gets better gas mileage. Unfortunately, my Bank 2 catalytic system is acting up. Thanks for your comments.
Burning Brakes
Joined: Aug 2004
Posts: 945
Likes: 0
From: Bloomingdale IL
P0430 Catalyst System Low Efficiency Bank 2 ECM. It is nothing just reset it. Here is the list of codes for future reference.
http://www.corvetteactioncenter.com/....php?qstId=566
http://www.corvetteactioncenter.com/....php?qstId=566
Tech Contributor
Joined: Mar 2003
Posts: 12,094
Likes: 197
From: Colorado Springs, CO
St. Jude Donor '08-'09-'10-'11
Disconnect the battery for 30 seconds and power back up to erase the code and see if it comes back.
To the response on turning off a code....bad idea. The tuning of headers should never require the deleteing of a code. In this case the Cats didnt heat up fast enough and tripped the code.
To the response on turning off a code....bad idea. The tuning of headers should never require the deleteing of a code. In this case the Cats didnt heat up fast enough and tripped the code.
Burning Brakes
Joined: Oct 2005
Posts: 1,131
Likes: 0
From: Dallas Texas
I had this code for a while. we sorted this out and tracked it down to a damaged O2 sensor wire (common in header installations with a tunnel plate). Once the O2 sensor was replaced the code never came back (7k+ miles). Others have eliminated this code with tuning. I do not receommend turning the sensor off.
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Thread Starter
Racer
Joined: Apr 2005
Posts: 351
Likes: 0
From: Louisville Kentucky
Originally Posted by SpinMonster
Disconnect the battery for 30 seconds and power back up to erase the code and see if it comes back.
To the response on turning off a code....bad idea. The tuning of headers should never require the deleteing of a code. In this case the Cats didnt heat up fast enough and tripped the code.
To the response on turning off a code....bad idea. The tuning of headers should never require the deleteing of a code. In this case the Cats didnt heat up fast enough and tripped the code.
I discussed this today with another wise man at Dynatech. He explained that the subject cat/sensor combo might have been overwhelmed by the recent changes (tune/Honker/FAST) as they interacted with the car's computer to deal with the new air/fuel/spark situation. He also recommeded the reset strategy.
He also explained that we may have to do the reset more than once and that there is a back up strategy, too. If the reset doesn't work after repeated attempts, we can try anti-fouling washers (Chevy small-block spark plug voodoo available at Pep Boys/Auto Zone.) applied at the rear O2 sensor/bung junction. Apparently, two are required per side. The first has to be drilled to fit the sensor and the other just fits after that. When reassembled, the sensor is just far enough in the stream to do it's job but not so far in to be too sensitive to do it's job. I won't profess to understand this well enough to present the lecture at the engineering school tomorrow but it sounds "reasonable."
Thanks again to all. Hopefully this is it.
