New true dual magnapack install
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Joined: Jan 2009
Posts: 10,731
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From: Concord, NC
The is not the first time for codes at all... happens every so often and I have had it, but I was also having an issue with my truck. Secondly, any exhaust leak around there area is ALMOST GUARANTEED to set off a CEL. Those senors are so sensitive, that's how you know they are working. My issue with shutting off sensors is this: If you have an issue with your truck, you won't know. That is very risky and can lead to issues. Those monitor to make sure your converters are functioning ok.
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Joined: Jan 2009
Posts: 185
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From: IL
Mine were welded onto the new pipe about 2" behind the cats tube exit.
Just got back from getting the code cleared and there was also a small leak at the 02 sensor bung that they fixed. He said he doubted it was enough of a leak to throw the code.
I'll let you know when and if it comes back on.
Just got back from getting the code cleared and there was also a small leak at the 02 sensor bung that they fixed. He said he doubted it was enough of a leak to throw the code.
I'll let you know when and if it comes back on.
The location of the O2 sensor could be the issue, but I can't say for sure. When I had mine done, the O2 sensors were placed 6 inches away from the cats.
The exhaust leak is another possibility. When my truck had leaking exhaust manifolds due to snapped off rear studs, it eventually threw a check engine light. It wasn't a catalyst code like yours though, it was a lean on bank 2 code due to the outside air getting sucked in around the leaky area and being metered by the sensor. Once I had headers put on with fresh gaskets to fix the leak, I cleared the lean code and it never came back...so that was the problem.
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Senior Member
Joined: Nov 2010
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From: Baltimore, MD
So far so good.
Put about 200 miles on it this weekend and no cel yet.
Hopefully it WAS the little exhaust leak around the left 02 sensor bung.
Put about 200 miles on it this weekend and no cel yet.
Hopefully it WAS the little exhaust leak around the left 02 sensor bung.
Last edited by CAGE RATTLER; Mar 29, 2011 at 12:51 AM.
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Senior Member
Joined: Nov 2010
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From: Baltimore, MD
Yours does??
How long did it take to get them after getting your exhaust?
Just curious if mine will come back after it breaks in more.
I only had the 420 code on mine so hoping it was the leak they found.
Seems like it would be both codes if it were the cats.
How long did it take to get them after getting your exhaust?
Just curious if mine will come back after it breaks in more.
I only had the 420 code on mine so hoping it was the leak they found.
Seems like it would be both codes if it were the cats.
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Joined: Feb 2009
Posts: 674
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From: Almost Heaven
Almost immediately. I had my high flows on for a year before I did duals and they never threw a code until the duals went in. But if you listen to my videos you'll hear a clinking sound on acceleration/rev. I swear I think something is loose in the cat(s). I checked the heat shield, hangers, everything and that's all I can come up with. Sometimes I only get the 0420 code. Other times I get both.