CEL p0456 on 2013 n/a help! - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

frs_caskey · 04-17-2018, 05:37 PM

I have a 2013 FRS manual n/a with 50k miles. Stock except for gruppe s cattless header, mxp comp rs exhaust, and oft stage 2 tune(mods have been on for a year with no problem till now)
Just had the p0456 cel pop up for evap system. Tried doing some research and people say the gas cap but mine is tight. I cleared the code to see if it will come back on but as I've been driving it doesn't seem quite as quick as usual, has hesitation when first pushing gas pedal, and runs rough in reverse slow speed.
Any help or tips would be great, I tried looking for loose vacuum lines but can't find where evap system is.

frs_caskey · 04-20-2018, 07:26 AM

Update: been 2 days since I cleared it and it now came back on. Does anyone have any experience with this issue, or any advice they can give me? Thanks

steve99 · 04-20-2018, 11:38 AM

check evap canister hoses
check evap hoses under intake manifold have not popped off or cracked loose
check evap purge solenoid connection

use oft to check ltft at idle (over 10% or so) if its high you likely have leak
check idle manifold vacuum should be about -9 psi

https://www.engine-codes.com/p0456_subaru.html

guybo · 04-20-2018, 01:37 PM

You need techstream to test whether the evap solenoid valves are closing. Sometimes they build up crud and can't seat properly or just shit the bed. I was going to say to go into RomRaider and just disable the CEL since it is just the Evap system.... but P0456 isn't turn-offable.

04-17-2018, 05:37 PM	#1
frs_caskey Senior Member Join Date: Oct 2016 Drives: 2013 FRS DGM. Location: California Posts: 106 Thanks: 25 Thanked 40 Times in 19 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	CEL p0456 on 2013 n/a help! I have a 2013 FRS manual n/a with 50k miles. Stock except for gruppe s cattless header, mxp comp rs exhaust, and oft stage 2 tune(mods have been on for a year with no problem till now) Just had the p0456 cel pop up for evap system. Tried doing some research and people say the gas cap but mine is tight. I cleared the code to see if it will come back on but as I've been driving it doesn't seem quite as quick as usual, has hesitation when first pushing gas pedal, and runs rough in reverse slow speed. Any help or tips would be great, I tried looking for loose vacuum lines but can't find where evap system is.

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04-20-2018, 07:26 AM	#2
frs_caskey Senior Member Join Date: Oct 2016 Drives: 2013 FRS DGM. Location: California Posts: 106 Thanks: 25 Thanked 40 Times in 19 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	Update: been 2 days since I cleared it and it now came back on. Does anyone have any experience with this issue, or any advice they can give me? Thanks

04-20-2018, 11:38 AM	#3
steve99 Banned Join Date: Dec 2013 Drives: FT86 Location: Australia Posts: 7,998 Thanks: 1,035 Thanked 4,987 Times in 2,981 Posts Mentioned: 598 Post(s) Tagged: 2 Thread(s)	check evap canister hoses check evap hoses under intake manifold have not popped off or cracked loose check evap purge solenoid connection use oft to check ltft at idle (over 10% or so) if its high you likely have leak check idle manifold vacuum should be about -9 psi https://www.engine-codes.com/p0456_subaru.html

04-20-2018, 01:37 PM	#4
guybo Huge E85 fan! Join Date: May 2016 Drives: 2016 Scion FRS Location: Tampa, FL, USA Posts: 1,850 Thanks: 539 Thanked 1,010 Times in 605 Posts Mentioned: 32 Post(s) Tagged: 0 Thread(s)	You need techstream to test whether the evap solenoid valves are closing. Sometimes they build up crud and can't seat properly or just shit the bed. I was going to say to go into RomRaider and just disable the CEL since it is just the Evap system.... but P0456 isn't turn-offable.

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