P1170 and P0171 after front pipe install - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

FRBZGT · 08-26-2021, 12:20 AM

2013 Scion FRS

I recently replaced the front pipe from OEM to catless. I did literally nothing else besides that. After a ~5 minute drive the CEL popped up with P0171. I was a bit confused but reset it thinking it was a fluke. Drove two days without it coming back on and the car felt normal. Today it came back on again with P1170 added on to it. Car seems to idle a bit rough now.

I'm running a catless header and OFT but that has been on for over a year with no issues. It has a GrimmSpeed CAI but that has been on before I brought the car nearly 2 years ago. Those are the only mods outside of the front pipe.

I've tried searching but not much comes up. P117B seems to be a common code to go along with these two but I lack that.

Turdinator · 08-26-2021, 01:15 AM

Quote:

Originally Posted by FRBZGT

2013 Scion FRS

I recently replaced the front pipe from OEM to catless. I did literally nothing else besides that. After a ~5 minute drive the CEL popped up with P0171. I was a bit confused but reset it thinking it was a fluke. Drove two days without it coming back on and the car felt normal. Today it came back on again with P1170 added on to it. Car seems to idle a bit rough now.

I'm running a catless header and OFT but that has been on for over a year with no issues. It has a GrimmSpeed CAI but that has been on before I brought the car nearly 2 years ago. Those are the only mods outside of the front pipe.

I've tried searching but not much comes up. P117B seems to be a common code to go along with these two but I lack that.

I suggest you take a log with your OFT and see why it thinks you're running lean. Or perhaps reflash your tune.

jason_456788 · 08-26-2021, 05:16 AM

I got the same issue it's because of the CAI. I put it back to stock intake with K&N drop in filter and problem solved. It's because the CAI with Catless you need a custom tune from OFT

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Boccaccio · 08-26-2021, 08:05 AM

Check your exhaust system for leaks. Pay particular attention to the header-overpipe and overpipe-frontpipe connection.

I suggest using a shop-vac with blowing function and soapy water:

FRBZGT · 08-26-2021, 12:13 PM

Quote:

Originally Posted by Turdinator

I suggest you take a log with your OFT and see why it thinks you're running lean. Or perhaps reflash your tune.

LTFT is at ~39% which is bad right?

jason_456788 · 08-26-2021, 12:27 PM

Quote:

Originally Posted by FRBZGT

LTFT is at ~39% which is bad right?

That's what I had... Also, my other experience was exhaust leaks between sensors. It would also make it at 39%

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p1l0t · 08-26-2021, 06:01 PM

O2 sensor AND a vacuum leak... sounds like an exhaust leak to me.

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FRBZGT · 08-30-2021, 11:25 PM

Quote:

Originally Posted by p1l0t

O2 sensor AND a vacuum leak... sounds like an exhaust leak to me.

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What do you know you are correct. Turns out a whole ass nut came off my header and another one was loose. Learned that you should invest in good tools and not just hope you got it tight enough. I still have a minor leak around the gasket but my fuel trims have returned to normal so I'm gonna call it good enough until this weekend.

08-26-2021, 12:20 AM	#1
FRBZGT Junior Member Join Date: Nov 2019 Drives: 2013 FRS Location: Ohio Posts: 5 Thanks: 0 Thanked 1 Time in 1 Post Mentioned: 0 Post(s) Tagged: 0 Thread(s)	P1170 and P0171 after front pipe install 2013 Scion FRS I recently replaced the front pipe from OEM to catless. I did literally nothing else besides that. After a ~5 minute drive the CEL popped up with P0171. I was a bit confused but reset it thinking it was a fluke. Drove two days without it coming back on and the car felt normal. Today it came back on again with P1170 added on to it. Car seems to idle a bit rough now. I'm running a catless header and OFT but that has been on for over a year with no issues. It has a GrimmSpeed CAI but that has been on before I brought the car nearly 2 years ago. Those are the only mods outside of the front pipe. I've tried searching but not much comes up. P117B seems to be a common code to go along with these two but I lack that. Last edited by FRBZGT; 08-26-2021 at 12:21 AM. Reason: typo

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08-26-2021, 05:16 AM	#3
jason_456788 Member Join Date: Mar 2019 Drives: 2017 brz Location: US Posts: 26 Thanks: 0 Thanked 9 Times in 6 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	I got the same issue it's because of the CAI. I put it back to stock intake with K&N drop in filter and problem solved. It's because the CAI with Catless you need a custom tune from OFT Sent from my SM-N960U1 using Tapatalk

08-26-2021, 08:05 AM	#4
Boccaccio CAD monkey Join Date: Aug 2016 Drives: '15 GT86 Giallo - Supercharged Location: Slovenia Posts: 78 Thanks: 16 Thanked 67 Times in 37 Posts Mentioned: 1 Post(s) Tagged: 0 Thread(s)	Check your exhaust system for leaks. Pay particular attention to the header-overpipe and overpipe-frontpipe connection. I suggest using a shop-vac with blowing function and soapy water:

08-26-2021, 06:01 PM	#7
p1l0t Senior Member Join Date: Jan 2016 Drives: 2016 Subaru BRZ Hyperblue Location: West Hartford, CT Posts: 8,478 Thanks: 22,741 Thanked 9,438 Times in 4,847 Posts Mentioned: 58 Post(s) Tagged: 1 Thread(s)	O2 sensor AND a vacuum leak... sounds like an exhaust leak to me. Sent from my SM-G975U using Tapatalk

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