PO171 code and traction light - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

WNDSRFR · 04-10-2019, 01:14 PM

1950 miles after the recall was done I got a PO171 code and the traction control light came on. Ever since the recall the car has had a weird idle dip to where the engine almost stalls. I got the big idle dip and the CEL and traction light came on. Drove home ,the car ran fine. I read the code with a OFT and cleared it. I started the car and it ran kinda rough. I figured I would log fuel mixtures today. Went to start the car this morning and it will not run. I plan on towing it to the dealer on Friday.
I was wondering if anyone knows what might be going on so I can talk intelligently to the service guy.

humfrz · 04-10-2019, 02:01 PM

Well, THAT sucks -

I'd just let them know what code it threw and let them figure it out. Then they may tell you that you should have left the code so they could diagnose it better.

Oh, I'd start by looking for a vacuum leak -

humfrz

steve99 · 04-10-2019, 06:37 PM

Yes as above

Vaccuum leak like hose on bottom of intake manifold or exhaust leak letting 02sensor see fresh air will do that. Since it now wont stsrt more likely intake leak. Could also be a bunch of other things like maf or 02 sensor bad

Also check the DI computer has all three bolts tight it box on side of motor, bots are how it get earth\ground .

https://www.autocodes.com/p0171_subaru.html

04-10-2019, 01:14 PM	#1
WNDSRFR Senior Member Join Date: Jan 2014 Drives: FR-S,GTI Location: Cocoa, Florida Posts: 1,189 Thanks: 235 Thanked 868 Times in 442 Posts Mentioned: 13 Post(s) Tagged: 0 Thread(s)	PO171 code and traction light 1950 miles after the recall was done I got a PO171 code and the traction control light came on. Ever since the recall the car has had a weird idle dip to where the engine almost stalls. I got the big idle dip and the CEL and traction light came on. Drove home ,the car ran fine. I read the code with a OFT and cleared it. I started the car and it ran kinda rough. I figured I would log fuel mixtures today. Went to start the car this morning and it will not run. I plan on towing it to the dealer on Friday. I was wondering if anyone knows what might be going on so I can talk intelligently to the service guy.

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04-10-2019, 02:01 PM	#2
humfrz Senior Member Join Date: May 2013 Drives: 2013 FR-S, white, MT Location: Puyallup, WA Posts: 30,432 Thanks: 29,826 Thanked 32,845 Times in 16,844 Posts Mentioned: 715 Post(s) Tagged: 2 Thread(s)	Well, THAT sucks - I'd just let them know what code it threw and let them figure it out. Then they may tell you that you should have left the code so they could diagnose it better. Oh, I'd start by looking for a vacuum leak - humfrz

04-10-2019, 06:37 PM	#3
steve99 Banned Join Date: Dec 2013 Drives: FT86 Location: Australia Posts: 7,996 Thanks: 1,035 Thanked 4,993 Times in 2,983 Posts Mentioned: 598 Post(s) Tagged: 2 Thread(s)	Yes as above Vaccuum leak like hose on bottom of intake manifold or exhaust leak letting 02sensor see fresh air will do that. Since it now wont stsrt more likely intake leak. Could also be a bunch of other things like maf or 02 sensor bad Also check the DI computer has all three bolts tight it box on side of motor, bots are how it get earth\ground . https://www.autocodes.com/p0171_subaru.html

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