Check engine light came on (p0172) - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

milkesfrs · 05-20-2013, 10:04 AM

Morning Guys.

Yesterday both my CEL and LS light came on. The LS turn off by itself after about 30 miles of driving the CEL is still on . I pull out my handy dandy OBD II and I pulled this code (p0172 System too rich bank 1 ) .

The only mod I have is a axle back exhaust and a Perrin crank pulley. The question I wanted to know is do you think the mods that I have on my FRS would throw this kind of code ? I am going to the dealer tomorrow and don't want to get scammed. Im thinking its a O2 sensor .

Thanks !!

CaptainSlow · 05-20-2013, 10:22 AM

I don't think either of those mods would cause that. If you had an intake, maybe...but not a pulley and muffler replacement

CaptainSlow · 05-20-2013, 11:01 AM

I wouldn't mention the mods, though - the muffler may be obvious, but the pulley might get overlooked. There is no plausible way they can link the muffler and that code.

Wo6M · 05-20-2013, 07:49 PM

Can you scope out your data stream with engine running ? If so what is the voltage reading of the O2 with the fault active ?

Astroboy · 10-04-2014, 11:30 PM

Quote:

Originally Posted by milkesfrs

Morning Guys.

Yesterday both my CEL and LS light came on. The LS turn off by itself after about 30 miles of driving the CEL is still on . I pull out my handy dandy OBD II and I pulled this code (p0172 System too rich bank 1 ) .

The only mod I have is a axle back exhaust and a Perrin crank pulley. The question I wanted to know is do you think the mods that I have on my FRS would throw this kind of code ? I am going to the dealer tomorrow and don't want to get scammed. Im thinking its a O2 sensor .

Thanks !!

Did you ever fixed the issue? If so, what was it?

o_turtle · 08-17-2019, 03:33 AM

hi. i also got 0172, for aboht 6 months (on and off) tried cleaning MAF, KnN filter amd throttle body. it still comes back. has anyone permanently solved this?

05-20-2013, 10:04 AM	#1
milkesfrs Senior Member Join Date: May 2013 Drives: hot lava Location: Montgomery, IL Posts: 186 Thanks: 71 Thanked 107 Times in 56 Posts Mentioned: 2 Post(s) Tagged: 0 Thread(s)	Check engine light came on (p0172) Morning Guys. Yesterday both my CEL and LS light came on. The LS turn off by itself after about 30 miles of driving the CEL is still on . I pull out my handy dandy OBD II and I pulled this code (p0172 System too rich bank 1 ) . The only mod I have is a axle back exhaust and a Perrin crank pulley. The question I wanted to know is do you think the mods that I have on my FRS would throw this kind of code ? I am going to the dealer tomorrow and don't want to get scammed. Im thinking its a O2 sensor . Thanks !!

05-20-2013, 10:22 AM	#2
CaptainSlow Senior Member Join Date: Oct 2012 Drives: 2013 Scion FR-S Location: Mid-Michigan Posts: 799 Thanks: 392 Thanked 388 Times in 180 Posts Mentioned: 2 Post(s) Tagged: 0 Thread(s)	I don't think either of those mods would cause that. If you had an intake, maybe...but not a pulley and muffler replacement __________________ Ultramarine 2013 Scion FR-S 6MT

05-20-2013, 11:01 AM	#3
CaptainSlow Senior Member Join Date: Oct 2012 Drives: 2013 Scion FR-S Location: Mid-Michigan Posts: 799 Thanks: 392 Thanked 388 Times in 180 Posts Mentioned: 2 Post(s) Tagged: 0 Thread(s)	I wouldn't mention the mods, though - the muffler may be obvious, but the pulley might get overlooked. There is no plausible way they can link the muffler and that code. __________________ Ultramarine 2013 Scion FR-S 6MT

05-20-2013, 07:49 PM	#4
Wo6M Keep Calm And Drift On~ Join Date: May 2013 Drives: Scion FR-S WhiteOut 6 Speed Manual Location: Boca Raton ,FL Posts: 268 Thanks: 202 Thanked 114 Times in 61 Posts Mentioned: 13 Post(s) Tagged: 0 Thread(s)	Can you scope out your data stream with engine running ? If so what is the voltage reading of the O2 with the fault active ? __________________ 2013 Scion FR-S White Out Six Speed Manual Name: Deava Mods:

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08-17-2019, 03:33 AM	#6
o_turtle Junior Member Join Date: Aug 2019 Drives: White GT86 Location: Thailand Posts: 3 Thanks: 0 Thanked 0 Times in 0 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	hi. i also got 0172, for aboht 6 months (on and off) tried cleaning MAF, KnN filter amd throttle body. it still comes back. has anyone permanently solved this?

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