2017 Toyota Highlander with Lean Codes on both banks

Lewis

Moderator
Staff member
If you have a 2017 Toyota Highlander with Lean codes on both banks over 30% LTFT (also with possible EVAP code) then the problem is the EVAP Purge Valve getting intermittently stuck open. We are seeing quite a few of these.
 
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Brandon

Guest
I have a 2017 Highlander 3.5 80,000 miles, check engine light came on and only problem we’ve had is after filling up with gas which just turn over and wouldn’t start, had to let it sit for about 5 minutes before it would crank. Have codes....p0174( system too lean bank 2) p1170 fuel performance/port injector p0171 system too lean bank 1 p0505 idle air control system.....thanks
 
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Ben

Guest
Same car 2017 Highlander 3.5 72k miles while driving in highway from nyc to boston had check engine and awd light. Pulled over start diagnose and got 3 errors:
P0505- idle control system
P0174- system too.lean bank2
P0171- system too lean bank1
Clean codes
Turned off the engine.
Try to turn on, it does just cranking but didnt start
Tried for several times and after the fifth time it did start. Engine rpm at 1200 in idle..

Stoped after 80 miles. Same issue.
3 times the same day.
Disconnect the battery for 15 minute.
Connect negative pole again.
Drove for 12 miles no issue at all no errors
Idle rmp 780..
Any idea?
 
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smitty078

Guest
This sounds like the issue I'm seeing. Got CEL on with codes P0171, P0174, P117b, P0441, P0455
Cleared codes
Came back after about 600 miles
Cleared codes again knowing I was about to fill up.
Filled up tank, wouldn't start.
Sat for about 5 minutes, started and ran fine, no codes yet.

If this is the EVAP purge valve, how does one go about fixing it?
 
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Eileen

Guest
3rd time in a month Check engine/AWD lights come on. Two weeks ago, I was putting gas in my Highlander, then it wouldn't start! Waited about 5ish minutes and is started right up! My mechanic said the codes were PO171,PO174,PO455,PO505. My mechanic replaced the Purge solenoid. WHY has Toyota NOT addressed this issue? They recalled the 2018 and 2019. Time for Toyota to step up and take care of their customers
 
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Kevin Geiger

Guest
Mine just started doing this. Codes P0171, P0174, P0455 and P0441. Within the last couple of months I did change the spark plugs myself, and so I replaced the intake plenum gasket, had all kinds of hoses off, etc. I did take the throttle body off and forgot to buy a new seal so I did leave it there. Hopefully that's not where there is a problem. This has only happened after driving very long distances, filling up with gas and then trying to start it right away. Probably take to dealer to look at it.
 
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Brad Miles

Guest
If you have a 2017 Toyota Highlander with Lean codes on both banks over 30% LTFT (also with possible EVAP code) then the problem is the EVAP Purge Valve getting intermittently stuck open. We are seeing quite a few of these.
Lewis, I am trying to buy the evap purge valve and seeing widely different prices and wondering if I am looking at the correct part. Am I supposed to buy the “vapor canister purge valve” (about $32 at Advanced Auto) or a “vapor canister purge solenoid” ($529) at Toyota parts.com)? I know the dealer is usually much higher for parts but the difference here seems too much, so much that it appears I am looking at different parts. Can you confirm which is the correct one?
Thanks
Brad
 

AutoMod

Moderator
Staff member
Lewis, I am trying to buy the evap purge valve and seeing widely different prices and wondering if I am looking at the correct part. Am I supposed to buy the “vapor canister purge valve” (about $32 at Advanced Auto) or a “vapor canister purge solenoid” ($529) at Toyota parts.com)? I know the dealer is usually much higher for parts but the difference here seems too much, so much that it appears I am looking at different parts. Can you confirm which is the correct one?
Thanks
Brad
It will be best to consult with your local Toyota Dealers Parts department to verify this part number 25860-0p090. This video should help with location and such....

 
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Ben

Guest
3rd time in a month Check engine/AWD lights come on. Two weeks ago, I was putting gas in my Highlander, then it wouldn't start! Waited about 5ish minutes and is started right up! My mechanic said the codes were PO171,PO174,PO455,PO505. My mechanic replaced the Purge solenoid. WHY has Toyota NOT addressed this issue? They recalled the 2018 and 2019. Time for Toyota to step up and take care of their customers
After changing the purge valve did it fix the problem?
 
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DIYTY

Guest
My 2017 Highlander 3.5 has been having same issue as describe above. Replaced sparkplugs @ 60K with OEM plugs from Toyota Dealership. CEL light came on, dealer light, check AWD light. Codes 0171 & 0174.
Pulled and reinstalled plugs again. Cleared codes, drove 20 minutes with no problems. Car idles well, isn't rough and doesn't dip in RPM.
Next morning threw same codes after 5 minutes of drive time.
Had certified mechanic confirm plugs were properly installed. He suggested bad gas as the cause and to:
1. Drive car around town to burn up bad gas.
2. Add can of Berryman B-12 Chemtool to clean out entire fuel system, then fill car with premium fuel.
Have ordered OEM part Automod posted above from Toyota Dealership incase steps 1 and 2 don't clear code.
Will post results. Anyone have success with clearing codes?
 
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DIYTY

Guest
Update: I thoroughly cleaned my MAF sensor and reinstalled it. Also tightened down a few bolts on the air intake hoses. I had a slight oil drip and tightened the oil pan bolt down. Currently code free.
 
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DIYTY

Guest
Code came back the day after I posted (Code appeared while shifting into reverse). Cleaned throttle body, downstream 02 sensors with contact cleaner. Code went away for 200 miles. Tripped today while accelerating on a city road, gas tank was at 1/4 of a tank.
Was advised by mechanic to try replacing MAF. Going to order and replace.
 
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DIUTY

Guest
Update:
Have replaced the MAF Sensor and Gas cap, still throwing codes.
New codes are P1170 and P1178.
After resetting and driving around town no codes. Backing up tipped the code. Any suggestions would be appreciated.
 
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Linzyrae

Guest
Update:
Have replaced the MAF Sensor and Gas cap, still throwing codes.
New codes are P1170 and P1178.
After resetting and driving around town no codes. Backing up tipped the code. Any suggestions would be appreciated.
Are you still having issues? I have been dealing with the same and nothing is working. Very frustrated.
 
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