Exhaust Reroute

So I got my exhaust reroute done the a couple weeks ago, they charged me $300 which was a lot higher than I had expected.

After getting the exhaust reroute done, I've been getting a check engine light, code P0430 Catalyst System Below Efficiency Threshold (Bank 2). I ordered a new downstream O2 sensor for the drivers side and swapped it in today. I went for a test drive that was about 20 minutes and it kept coming back on. Even if I would clear it. It seems to only come on when I'm on the highway, it hasn't come on while I'm driving around town. Any ideas? Thanks!

 

Definitely following for updates on this one.

 

Really doesn't make any sense to me as the sensor has nothing to do with active monitoring south of it. Do you have the OEM catback system?

 

It's whatever the stock exhaust is from the factory, besides the reroute anyway. It's not the OEM performance exhaust either, just the normal one. Truck is only just over a year old too!

I was thinking they had maybe fried the downstream o2 sensor somehow when they welded the reroute. I did a drive a few minutes ago and watches all the o2 sensor voltages in the torque app connected to a Bluetooth obdII sensor and all the voltages for each of the sensors looked normal to me.

 

Try some high temp copper anti seize. That fixed all my CEL problems 2 years back.

 

When I put in the new o2 sensor, I did put copper anti seize on the threads. Are you saying I should put it on the actual sensor?

 

Gotta admit, these code issues have me rethinking the reroute. I want the ground clearance but it's probably not enough of an issue to warrant dealing with sensor issues.

 

For the record. I’ve not had any code issues. Not aware of to many others having issues.

 

Oh no, just in the threads. I also took a wired brush and cleaned out the threads in the bung.

 

I have not had any CEL or issues. First I've heard of it ever.

Also the only reason I got a reroute was to bolt my skid up. Otherwise it is an audible warning for offroad and worked very well

 

I would have thought the same thing myself about frying the sensor, except they are designed for high heat and you probably would have noticed the damage. Thought, did you replace it with an OEM sensor? I bolted up the AEM after cats and even with a damaged cat they sent me, I had no code. The cats are both downstream and even the troubles some have stated about the reroute actually should not happen. In theory cutting the pipe off after the sensor should not throw a code. If in fact something from the reroute is doing this, I can only imagine it would be flow related which is why I asked about your catback. I went 2.5 with a borla welded in, but I have no idea if your stock exhaust is the problem and somehow flow related. Last thought have you allowed the system to cycle and recheck itself I believe it could disappear if it was a momentary issue.

 

Hi all. Need to get the reroute done. Everytime I hit my skid with the drop it bends a little more and its now hitting the exhaust. Anyone know of a shop in Ma or southern Nh to do this?

 

I’d be willing to bet most of the CEL issues are from exhaust leaks. Even a tiny exhaust leak can make AFR readings go insane.

I have had several exhausts made for my cars over the years and I have NEVER left an exhaust shop without a leak.

hover your hand around where the exhaust was welded and feel for any pulses of air. If you feel anything it will be enough to throw off your O2 sensors.

 

Take a rag and have someone cover the tailpipe and crawl up under the truck and listen for leaks. If you don't hear anything, your man could have damaged the wiring to the downstream oxygen sensor so check that as well.

 

So I don't have a buddy to hold the rag at the moment but I did attempt to zip tie a rag in the exhaust. I got under the truck and used soapy water. I didn't see any exhaust leaks. Will have to try again with a friend and report back.

What's weird is when I watch the sensor with torque they all look normal to me.

 

If there was a hole and depending on the size, you can usually hear a hissing when the tailpipe is covered. Do you have a code reader that can delete the code? I'd delete it and run it for a few days and see if it comes back. Could be a false positive

 

Sure do, I've been periodically clearing the code as it comes up and it keeps coming back.

Wanted to be sure so I got my wife to hold an rag over the exhaust tip and poked my head under the truck today. If there was an exhaust leak I couldn't hear a leak.

Starting to think it might be the catalytic converter. Temps seem to be the same side to side but when I revved the throttle a couple and watched the voltage each downstream o2 sensor was differnet. Graph of it is below

 

This makes me think even more that it's a leak. That graph indicates that your switching frequency is high (1-2 seconds) when it should be at a low switching frequency (~25 seconds). I'd be very surprised if it was the cat. It's too much of a coincidence. It's bank 2 sensor 2 so it's the sensor right after the drivers side cat; which I'd assume is where your guy was fooling around. O2 sensors are incredibly sensitive; a pin whole is enough to do it. That being said, check the heck out of that sensor to make sure he didn't damage the wires/make sure it's screwed on tight.

Edit: Just had a thought. Do you know if he dropped the exhaust completely or was lazy and welded it while it was still mounted? Shot in the dark but if he just shoved the stinger up in there then the part of the weld you can't see (the top) could be incomplete. If it's absolutely positively not a leak then the next step would be to replace the sensor. Then, go get your money back

 

I'm a 2nd gen, but the routing should be the same. This is a great reroute and makes a lot more sense in comparison to the OE style routing.

 

Does anyone sell the reroute pipe? I need to get this done and I have a hard time trusting a random exhaust shop to do it right.