deleted secondary cats, now engine light is on?

chaacole · 05-01-2016, 01:11 PM

hey guys i deleted the second cats this weekend, was good for two days then the engine light came on. took it to autozone to scan the codes but couldnt pull anything up. i was under the impression that deleting the second cats would not throw the engine light. whats going on?

Thanks, Chaz

Tuned Camaro · 05-01-2016, 01:20 PM

Without codes it's impossible to determine what is going on.

chaacole · 05-01-2016, 01:37 PM

i understand that, but the autozone couldnt pull it up. should i try advance or something? there shouldnt be any code associated with a secondary cat delete though right?

Glen e · 05-01-2016, 01:39 PM

See my answer in the other place you posted this duplicate post…

chaacole · 05-01-2016, 01:42 PM

ya i just pm'd him thanks, figure id start a different thread though for this issue.

Tuned Camaro · 05-01-2016, 01:43 PM

Can't hurt to try a different scan tool

chaacole · 05-01-2016, 02:44 PM

ya im gonna try advance or oreiley's so forth.

Ian SS · 05-01-2016, 03:30 PM

Mine have been gone for 2 weeks and have had no issues.

chaacole · 05-01-2016, 04:28 PM

weird, starting to think its another issue that just so happened to pop up after the cat delete. could it possibly be crappy welds and fresh air is getting sucked in where the pipes were welded and throwing off the o2s?

chaacole · 05-03-2016, 04:57 PM

throws a p2099 code, dealer cleared the code, came back the next day, looks like i will have to put the cats back on.. :(

Tuned Camaro · 05-03-2016, 05:06 PM

P2099 - Post Catalyst Fuel Trim System High Limit Bank 2 (from HP Tuners editor)

This indicates to me you either have a damaged O2 sensor (post primary cat) or there is a leak at one of the new welds on the passenger side.

The cats being removed by themselves would not cause this.

If you don't have access to a scan tool call and see if a local performance shop would hook up their tool and monitor the rear passenger O2 for you to see how it compares to the rear driver side.

Tr6 · 05-03-2016, 05:24 PM

Quote:

Originally Posted by Tuned Camaro

P2099 - Post Catalyst Fuel Trim System High Limit Bank 2 (from HP Tuners editor)

This indicates to me you either have a damaged O2 sensor (post primary cat) or there is a leak at one of the new welds on the passenger side.

The cats being removed by themselves would not cause this.

If you don't have access to a scan tool call and see if a local performance shop would hook up their tool and monitor the rear passenger O2 for you to see how it compares to the rear driver side.

+1 for info!

Yeah, my bet is that they couldn't weld the top part when they replaced the cats and there is a leak. I am at 54xx miles now about 4500 miles after my cats got cut out and no CELs.

Glen e · 05-03-2016, 05:31 PM

Interesting, when i was watching the guy do my 2nd cat delete, he started to weld and I asked him how he got the weld up top to be sealed, and he showed me how his weld tool was flexible. he did say it was very important to make sure that all these welds were 100 pct sealed…

Going on 1000 miles after cat delete, no CELs...

chaacole · 05-03-2016, 09:13 PM

ya thats what im thinking too, the guy that welded it for me did not have a flexible tip to reach the top spots, he said he was having difficutly getting to the top. so it is probably leaking and sucking in fresh air. i still have the cats, im going to take it another shop and see if they can do a better job sealing it. he also used 2.5 instead of 2.75. 2.5 was the biggest he had. is there a good scan tool i can get? mainly to just clear the code off after the new welds are done? not worrying about tuning it cause it will void the warranty. just something to wipe the computer code.

thanks

05-01-2016, 01:11 PM	#1
chaacole Drives: 2016 Camaro 1ss Join Date: Apr 2016 Location: Memphis Posts: 47	deleted secondary cats, now engine light is on? hey guys i deleted the second cats this weekend, was good for two days then the engine light came on. took it to autozone to scan the codes but couldnt pull anything up. i was under the impression that deleting the second cats would not throw the engine light. whats going on? Thanks, Chaz

05-01-2016, 01:39 PM	#4
Glen e Retired from Car mfrs.... Drives: 2LT RS/HR-V Join Date: May 2013 Location: /Fort Lauderdale Posts: 10,048	See my answer in the other place you posted this duplicate post… __________________ Glen CLICK HERE for detailing a new car: detailing for non detailers CLICK HERE for how to rinseless CLICK HERE for EASY wheel sealant

05-01-2016, 03:30 PM	#8
Ian SS Drives: 2016 1SS, 2017 JKU Wrangler Join Date: Mar 2016 Location: San Diego Posts: 876 View My Garage	Mine have been gone for 2 weeks and have had no issues. __________________ SLO 1SS - sold 1SS MRC NPP 6MT 2018 Ram Rebel 4x4 5.7

05-03-2016, 05:31 PM	#13
Glen e Retired from Car mfrs.... Drives: 2LT RS/HR-V Join Date: May 2013 Location: /Fort Lauderdale Posts: 10,048	Interesting, when i was watching the guy do my 2nd cat delete, he started to weld and I asked him how he got the weld up top to be sealed, and he showed me how his weld tool was flexible. he did say it was very important to make sure that all these welds were 100 pct sealed… Going on 1000 miles after cat delete, no CELs... __________________ Glen CLICK HERE for detailing a new car: detailing for non detailers CLICK HERE for how to rinseless CLICK HERE for EASY wheel sealant

05-01-2016, 01:20 PM	#2
Tuned Camaro Drives: 2016 Camaro SS Join Date: Apr 2016 Location: Clayton, NC Posts: 58	Without codes it's impossible to determine what is going on.

05-01-2016, 01:37 PM	#3
chaacole Drives: 2016 Camaro 1ss Join Date: Apr 2016 Location: Memphis Posts: 47	i understand that, but the autozone couldnt pull it up. should i try advance or something? there shouldnt be any code associated with a secondary cat delete though right?

05-01-2016, 01:42 PM	#5
chaacole Drives: 2016 Camaro 1ss Join Date: Apr 2016 Location: Memphis Posts: 47	ya i just pm'd him thanks, figure id start a different thread though for this issue.

05-01-2016, 01:43 PM	#6
Tuned Camaro Drives: 2016 Camaro SS Join Date: Apr 2016 Location: Clayton, NC Posts: 58	Can't hurt to try a different scan tool

05-01-2016, 02:44 PM	#7
chaacole Drives: 2016 Camaro 1ss Join Date: Apr 2016 Location: Memphis Posts: 47	ya im gonna try advance or oreiley's so forth.

05-01-2016, 04:28 PM	#9
chaacole Drives: 2016 Camaro 1ss Join Date: Apr 2016 Location: Memphis Posts: 47	weird, starting to think its another issue that just so happened to pop up after the cat delete. could it possibly be crappy welds and fresh air is getting sucked in where the pipes were welded and throwing off the o2s?

05-03-2016, 04:57 PM	#10
chaacole Drives: 2016 Camaro 1ss Join Date: Apr 2016 Location: Memphis Posts: 47	throws a p2099 code, dealer cleared the code, came back the next day, looks like i will have to put the cats back on.. :(

05-03-2016, 05:06 PM	#11
Tuned Camaro Drives: 2016 Camaro SS Join Date: Apr 2016 Location: Clayton, NC Posts: 58	P2099 - Post Catalyst Fuel Trim System High Limit Bank 2 (from HP Tuners editor) This indicates to me you either have a damaged O2 sensor (post primary cat) or there is a leak at one of the new welds on the passenger side. The cats being removed by themselves would not cause this. If you don't have access to a scan tool call and see if a local performance shop would hook up their tool and monitor the rear passenger O2 for you to see how it compares to the rear driver side.

05-03-2016, 09:13 PM	#14
chaacole Drives: 2016 Camaro 1ss Join Date: Apr 2016 Location: Memphis Posts: 47	ya thats what im thinking too, the guy that welded it for me did not have a flexible tip to reach the top spots, he said he was having difficutly getting to the top. so it is probably leaking and sucking in fresh air. i still have the cats, im going to take it another shop and see if they can do a better job sealing it. he also used 2.5 instead of 2.75. 2.5 was the biggest he had. is there a good scan tool i can get? mainly to just clear the code off after the new welds are done? not worrying about tuning it cause it will void the warranty. just something to wipe the computer code. thanks

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