CEL for a catless front pipe? - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

taylorsankey · 08-05-2014, 07:30 PM

It says everywhere that you wont get a CEL for removing the secondary cat. Which makes sense cuz there arent any sensors after it.

I installed an invidia catless front pipe 10 days ago. Randomly the CEL came on. Today took it to the dealer, and they said it was cuz the removal of the secondary cat..$90 cuz aftermarket.

Is it possible to get CEL or are they bs?

chas3wba0 · 08-05-2014, 07:38 PM

I strongly doubt that's the cause of your CEL

fantah · 08-05-2014, 07:46 PM

There's no sensor there. That's BS

Foobar · 08-06-2014, 08:13 AM

Sounds like BS. What code was being thrown?

Sent from my Nexus 5 using Tapatalk

steve99 · 08-06-2014, 08:36 AM

Quote:

Originally Posted by taylorsankey

It says everywhere that you wont get a CEL for removing the secondary cat. Which makes sense cuz there arent any sensors after it.

I installed an invidia catless front pipe 10 days ago. Randomly the CEL came on. Today took it to the dealer, and they said it was cuz the removal of the secondary cat..$90 cuz aftermarket.

Is it possible to get CEL or are they bs?

Its possible you have an exhaust leak at gaskets near the 02 sensors , and the "fresh" air getting into system on overun is triggering cel. Might have been caused when you changed front pipe. Were new gaskets used on front pipe ? did you change/remove overpipe ? assume you still have standard headers

what was code thrown up ?

zc06_kisstherain · 08-06-2014, 10:37 AM

probably that CEL isnt relating to your front pipe. pull the code first

taylorsankey · 08-06-2014, 05:09 PM

Quote:

Originally Posted by steve99

Its possible you have an exhaust leak at gaskets near the 02 sensors , and the "fresh" air getting into system on overun is triggering cel. Might have been caused when you changed front pipe. Were new gaskets used on front pipe ? did you change/remove overpipe ? assume you still have standard headers

what was code thrown up ?

After install, i felt no leaks. Stock headers/overpipe. New gasket. Ill find out the code tomorrow; obd2 sensor arriving tomorrow. will post

taylorsankey · 08-06-2014, 05:36 PM

Quote:

Originally Posted by Marchy

the dealer didn't give you the code after they pulled it?

nope

skyloran · 08-06-2014, 05:59 PM

Quote:

Originally Posted by taylorsankey

nope

my car have N1 catless frontpipe installed for 6 months now, dont see CEL at all. i have stock header, motiv overpipe, N1 catless frtonpipe and Nameless exhaust. make sure all the bolts are tighten up well. if there is leak which most likely cause the CEL

taylorsankey · 08-07-2014, 07:19 PM

i called for the code. they said P0420

ran my car with elm. P0420- catalyst system below threshold bank 1

what does that mean exactly and how does the car know about a catalyst problem..?

steve99 · 08-07-2014, 10:12 PM

Quote:

Originally Posted by taylorsankey

i called for the code. they said P0420

ran my car with elm. P0420- catalyst system below threshold bank 1

what does that mean exactly and how does the car know about a catalyst problem..?

I believe it looks at the reading from both o2 sensors one before cat and one after in headers and compares and works out if cat is working efficiently.

Either an o2 sensor has a problem (would be rear one else you car would be running crap as the front one is used for fueling) or you have exhaust leak or cat in headers is damaged/removed.

I'll put a dollar on an exhaust leak

08-05-2014, 07:30 PM	#1
taylorsankey Member Join Date: May 2014 Drives: 13 FRS Location: j Posts: 19 Thanks: 14 Thanked 1 Time in 1 Post Mentioned: 0 Post(s)	CEL for a catless front pipe? It says everywhere that you wont get a CEL for removing the secondary cat. Which makes sense cuz there arent any sensors after it. I installed an invidia catless front pipe 10 days ago. Randomly the CEL came on. Today took it to the dealer, and they said it was cuz the removal of the secondary cat..$90 cuz aftermarket. Is it possible to get CEL or are they bs?

08-05-2014, 07:38 PM	#2
chas3wba0 Senior Member Join Date: Jul 2013 Drives: Yes Location: Bay Area, CA Posts: 1,053 Thanks: 1,630 Thanked 813 Times in 407 Posts Mentioned: 5 Post(s)	I strongly doubt that's the cause of your CEL __________________ "If thy pleaſure be in Underſteere, thou art Weird." - Distraxi

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08-05-2014, 07:46 PM	#3
fantah Senior Member Join Date: Oct 2013 Drives: 2013 BRZ Premium Black Location: Ewa Beach Posts: 246 Thanks: 9 Thanked 54 Times in 37 Posts Mentioned: 0 Post(s)	There's no sensor there. That's BS

08-06-2014, 08:13 AM	#4
Foobar SLO NO MO Join Date: Jul 2012 Drives: '19 Tesla Model 3 Performance Location: NY, USA Posts: 2,961 Thanks: 224 Thanked 1,062 Times in 738 Posts Mentioned: 34 Post(s)	Sounds like BS. What code was being thrown? Sent from my Nexus 5 using Tapatalk

08-06-2014, 10:37 AM	#6
zc06_kisstherain Join Date: Aug 2012 Drives: SWP BRZ Location: NJ Posts: 3,196 Thanks: 727 Thanked 670 Times in 510 Posts Mentioned: 15 Post(s)	probably that CEL isnt relating to your front pipe. pull the code first

08-07-2014, 07:19 PM	#10
taylorsankey Member Join Date: May 2014 Drives: 13 FRS Location: j Posts: 19 Thanks: 14 Thanked 1 Time in 1 Post Mentioned: 0 Post(s)	i called for the code. they said P0420 ran my car with elm. P0420- catalyst system below threshold bank 1 what does that mean exactly and how does the car know about a catalyst problem..?

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