P11F1 Error Code - Anybody ran into this (on a 2019 TRD OR 6MT)?

Posted in 3rd Gen Tacoma (2016+) but realized it should've been a bit more technical.
Copied/Cross-posted; hopefully somebody on TW has a bit more insight.

Howdy all,

Relatively new, with a 2019 TRD OR 6MT.
Pre drive to a bowling outing earlier today, the check engine light kicked in.
(I was thinking the new Tacos might have a decent system to notify errors, but they don't)
Pulled out my bluetooth OBD2 and Torque program: P11F1 - Powertrain.
Used Carista: P11F1 Manufacturer-specific code
Ran my VIN and states no problems with my car.

Anybody on the board can check what P11F1 for a taco is (as I couldn't find anything after a quick search)?
3xxx miles. No hard driving. No engine mods. Sound (speakers, under seat sub) upgrade. The truck was running fine to and back home from the bowling alley; no knocks/etc. Tank currently ~3/4 full on 91.

NOTE: I reset the error code (via Torque app) so i don't see the check engine light. Hopefully no problems occur when I get out later tonight (or for work tomorrow morning).

 

DTC P11F100 Cylinder #6 Air-Fuel Ratio Imbalance (Port)

The difference in air fuel ratio between the cylinders exceeds the threshold (2 trip detection logic).

• Fuel injector assembly (for port injection)
• Fuel injector assembly (for direct injection)
• Intake system
• Gas leak from exhaust system
• Ignition system
• Compression pressure
• Air fuel ratio sensor (bank 2 sensor 1)
• ECM

 

Why are you running 91?

 

@stefanlg55 thanks much appreciated!

I will check for loose parts/visual cues reachable under the hood in the dark.

Initially to see if I could feel/notice a difference...but no real reason for running 91; Used to hitting the 91 button for my other car. Any optimal reason to run 87 or 89 aside from $$$?

By chance do you know if this is common for previous gen Tacomas?

 

No the older Tacoma's could not monitor codes such as this.
With a different octane of fuel burning at a different rate then what the ECM is seeing as a known good condition I wouldn't be surprised if you start seeing more of these codes for other cylinders.
You certainly may have another issue going on, i would clear the code and see if it comes back to that exact cylinder. Then there may be something going on with that cylinder, but if it comes back to a different one I would be more suspect of the fuel.

 

@stefanlg55
Just did a quick 5min visual; nothing noticeable. (I will inspect longer tomorrow under daylight).
Alongside, did a 25min drive in all gears and up to freeway speeds (freeway approximately 5 mins) all long enough to hopefully register with the ECU.
No feeling of misfires/detonations/etc. (except for the accumulator clutch lag feeling).
Tank actually had a few needles above half, and < 2/3.
No check engine light throughout whole drive.
Ran Torque app for error codes; none (and kept the erased/historical P11F1, which I didn't know Torque reads ECU logs or however it works).

Doing a 30min drive to work tomorrow morning; hopefully nothing major happens.

Thanks for the input. All is very much appreciated.

If all stays the same, I will run the tank as best I can to empty, and fill with lower octane.

 

It looks like in particular P11F1 is 'Air fuel ratio cylinder imbalance monitor (for port injection of cylinder 6)'

So no expert but some options I would guess at include;
partially clogged port injector on # 6,
maybe bad connector on Port Injector #6 (but I think ECU will detect that directly),
Could be low compression on #6 possibly but I doubt it, would expect it to show up port or direct injection,
Could be bad plug or ignitor on #6, but I doubt it, and would expect it to show up port or direct injection,

These engines only run in port injection mode for a relatively small load range per my recollection (most commonly they run on direct injection), so there is a good chance that it isnt even an issue for alot of your drive.

I THINK this code may rely on the crankchaft position sensor to detect the issue. If that is true, then a bad crankshaft position sensor could be a cause as well (this sensor was source of a TSB or recall and often blamed for everything), but I have never heard this symtom being related to it... But in this case I certainly think it COULD be related. You will find numerous threads on it around here.

 

@BigWhiteTRD thanks. I'll pull out #6, check for debris and possibly give it a clean.

I had a bad crankshaft position code pop up in my daily driver car so I'm not overly concerned. (This would usually kill the engine. Albeit, it might not be the culprit as other error codes were already live).

@stefanlg55 FYI did my morning commute roughly 2 hours ago. 30ish minute drive. Same results as last night.

Any input is appreciated.

 

If the same code came back then it is coming related to that cylinder most likely. injector issue possible. Bring it to the dealer it still under warranty right?

 

@stefanlg55
Arrived home roughly 2 hours ago.
Nothing noticeable in the drive.
No check engine lights.
Ran Torque with the same historical logging; no new errors.

Yes it is under warranty. I may give it a go with the dealers tomorrow but I have just gotten a bit under the weather & may stay home/indoors for a day or two.

 

@shnaperz

hey, I’m running into nearly the same exact problem with my 2017 trd sport 6mt 3.5 v6

I’ve got 72,xxx miles on it now so I’m out of warranty. I’m getting a p11f0 code which comes back as as cylinder 5 fuel/air ratio imbalance (port)

the truck runs just fine and gets the same MPG it always has so I cleared the code and it stayed off for a while until I’d park somewhere and it would pop back up.

I ended up changing the cylinder 5 port fuel injector, thought things were ok but after a 600 mile trip it came back on.

I was wondering what ever came of your issue, what the dealership ended up fixing.
Thanks!

 

@ssprouse50

Hey Seth

It's been a while about this, but I recall believing the octane was the culprit. Below is what I recall following around the same timeframe:

• I scheduled an appointment with the dealer; but didn't go. Forgot the reason why.
• I purged my tank and switched to 87
• Problem occurred intermittently with the same fresh tank on 87.
• Ran tank to E as best as can (via normal driving and not heavy footed), continued with 87
• Never occurred since.

As of today:

• More than 12 months & no check engine lights occurred.
• No major engine/fuel or electrical upgrades. (few oil change(s), MESO puddle pods (PNP wiring harness), MESO tail light kit (PNP wiring harness), speakers, sub, interior lights, caddy horns)
• I didn't bring my truck in for the pump recall.
• I didn't post-check/wipe/clean any sensors or electronics.
• I didn't reset the ECU error codes (battery disconnect or torque app) since initial 87 octane change-up
• I am still running on 87

Sorry it didn't solve any problems, but hope it gives you a different view. Looking at the original post stating 3xxx mileage, I am currently closer to 30k and issue free. Good luck. If you find a resolution, keep this forum posted.

Cheers

 

Thanks so much, I usually run non ethanol fuel out of somehow thinking I’m doing my engine some good but I suppose maybe that’s the whole issue! I’ll be making the switch to 87 and hoping for the best.

thanks again for getting back to me, truly appreciate it!

 

I have a 2018 tacoma with 39000 miles...so of course just out of warranty. I've been getting an intermittent P11f0 code as well. I ran some lucus injector cleaner and put a full tank of 91 octane gas in the tank and it went away. I started back on 87 again and the light popped back on. Always the same cylinder. I got the fuel pump recall completed thinking it might be related but the light just popped on again. Wondering if anyone has any other info on this thanks.

 

My 2019 Highlander (D4S V6 - Same Engine as Tacoma) had an odd issue. 6000 miles. Rough idle, but everything else was fine. Check engine light came on. The dealer did a fuel pump recall, everything good. A week later, check engine light. Back to dealer, returned "everything OK". A week later check the engine light once again. I was a little pissed, to put mildly. Told the service writer to make sure the tech understands I am a 6'3" 235# Boxer who is really pissed off and looking for him, so spend some time on this one. Thankfully a master tech pulled all the plugs. #5 was rich. Replaced direct port injector. It was fine for the 700-mile drive (traded it in towards the Tacoma).

Drove since new always used high-quality gasoline, kept the tank full.



2/2021
R&R CYL #5 DIRECT INJECTOR. CLEARED CODES AND TEST DROVE IN CHECK MODE. ALL MO

R&R CYL #5 DIRECT INJECTOR. CLEARED CODES AND TEST DROVE IN CHECK MODE. ALL MO~|~C/S CHECK ENGINE LIGHT IS ON FOR THE THIRD TIME~|~FOUND CODE P117B00 DIRECT INJECTOR PERFORMANCE AND P017200 SYSTEM TOO RICH BANK 1. #5 DIRECT INJECTOR WAS LEAKING FUEL CAUSING A RICH CONDITION.~|~R&R CYL #5 DIRECT INJECTOR. CLEARED CODES AND TEST DROVE IN CHECK MODE. ALL MONITORS PASSED AND FUEL TRIMS ARE IN SPEC. T1-64 T2-57

Parts

Name
Part #
Qty
INJECTOR SET, FUEL
232090P09002
1
RING, FUEL INJECTOR
2325831010
2
RING, O
9030105011
2
RING, FUEL INJECTOR
2325631010
2
INSULATOR, INJECTOR
232910P010
2
RING, SNAP
90520A0062
2
SEAL, FUEL INJECTOR
2325531020
2

 

Thanks for the reply...at this point I'm thinking the most likely culprit is the port injector....wondering if inshould go the dealer route or try to change it myself...

 

Under warranty... dealer.

Out of warranty... start by pulling the plugs and looking at them.

I had a rat chew the knock sensor wiring, got an indicator of "reduced engine power" but cruise control is disabled when that happens. Muscle cramp issue makes it hard to hold throttle, one reason I love the adaptive cruise control. So rat, that was fixed. Fuel pump recall. Done. Numerous "rough running" leads to frustration. Finally got it all done, but still strikes me very odd to have seen a port injector failure like that.

Low miles (6200) at time of failure. I'm the only one who ever filled the vehicle (Costco, Shell, or Chevron) so well-known history. I caulked it up to "one of those 1 in million failures."

 

@Lionfishtaco for what it’s worth, you can get the same denso port injector from o’reiley auto parts for $150ish.

if it’s cylinder either 1-3-5 giving you issues it is literally a 15 minute job. Right on top of the engine on the passenger side. I did mine, it just didn’t fix my code issue.

 

Appreciate the replies guys....I might just change out the plug and injector and see what happens. The code indicates cylinder 5 so I hope its easy!

 

Pull 1 3 5 (the easy ones) so you can compare them. Take photos and post them up.