What can cause code P11ED?

I’ve read the threads about the P11EC air/fuel ratio code guys get at low mileage and have the head replaced under warranty. What else can cause it other than the cylinder head problem.

I do almost all long trips on the highway, no off roading other than driving around construction sites some. I change oil every 5k.

Back in February the CEL came on around 147,000 miles. Code P11ED. The dealer said it needed the head replaced but after some prying they admitted they never did any real diagnostics on it and recommended that based entirely on the code and Toyota having a fix for a similar code. So I declined the $6500 quote to replace the head.

The check engine light would come and go over the next few thousand miles. It would go off for a while after running higher octane gas. I eventually noticed it may run a little rough at idle but barely noticeable. It started throwing another code, p219d. I can’t find anything about Toyotas with that code. The CEL started staying on continuously.

I decided to switch around a couple injectors just to see if it made a difference. When I took the intake plenum off there was an excessive amount of oil in the intake manifold and carbon on the intake valves but only on the bank 2 side. The bank 1 side was all clean.

A different Toyota dealer recently looked at it and checked the compression. They said compression was low on cylinder 2 but didn’t give me any numbers. They recommended replacing both cylinder heads.

Now it’s got 156,000 miles. Still running fine and getting the same mpg as it always has. I’m thinking oil from the pcv valve is causing the carbon buildup on the intake valves and not letting them seal properly. Is this a reasonable theory? Any other ideas? After seeing my intake I’d say a catch can is a good idea for everybody.

 

I'm having the same issue, at 233k. Compression test came back with 90psi in cyl #2. I've ordered a replacement cylinder head. Not looking forward to doing this job....

 

I got a spare motor for sale if you wanna swap the motor instead

 

Looks pretty much identical to 3 motors I've had apart. One with 24k miles, 85k, and 105k miles. 24k mile one wasnt as bad, but same thing/same bank

 

I realize it’s a hot button topic, but this is why I installed a catch can from J&L. I empty about 2-4oz of oil every 1500-2000 miles. I imagine allowing that to buildup over 150k miles isn’t good.

 

Lol no. Stop and think about what you just posted.
You lose 2-4 oz every 1500-2000 miles from the case? In 10K miles, that would be three quarter to a quart and a half every 10K miles! I check my oil every 5K or so and change it every 10K. There is no change in oil level man, especially not a quart! Don't know what you are catching, but my suspicion is condensation mixed with soot, which, if left alone, would evaporate the water and soot goes away at oil change.
Think before you post.

 

Ok man. Have a great day.

 

As I've edited the theory is reasonable, to me the PCV as root cause is doubtful.

It's worth trying to clean things up. A Seafoam, Techtron or Redline fuel system cleaner for a couple of tanks, along with a bit of 'Italian tuneup' would be an inexpensive experiment.

Valves have carboned on vehicles forever. PCVs entered the picture en mass in production cars in the 60's. If there was a historic problem here 'catch cans' would be the OE norm and part of the service routine.

 

Monday night went to pull my 2018 TRD Off Road into the driveway and the CEL came on. First time ever. I went to Auto Zone and used their code reader. It read to change the cylinder head and head casket. Also stated an air/fuel mix ratio imbalance in cylinder 3. Truck has 39,500 mile. I disconnected the negative terminal and the CLE went off. Truck runs fine, no significant changes in mileage. Oil changed every 5k. Purchased in Dec 2018.

 

It should be fine if you bring it in soon. Powertrain is 5yr/60k so you're almost over it. I would definitely bring it now and still have ~1-2 months post-repair to see if they muck anything else up while in there.

 

I agree. Take it in now and let them eat the $8k repair bill under warranty.

 

I'm going to make service appointment ASAP.

 

So I went to the dealership on Oct 30. A month and a half before my 5 year 60K warranty runs out. The tech diagnosed the problem as Emission System cleaning service. OK fine. Work was done and no problems. On Thursday morning CEL comes back on. Take it back to the dealership. They took two days to diagnose it's a misfire in cylinder three. They are going to replace the Cylinder head. Problem is now its 8 days out of warranty, however, the tech said he would put it through as a good faith repair since it was in there a month+ for the same thing and it's only 8 days. The truck has 41,000 miles. Sucks. Should I ask for extended coverage since this happened. I would like some assurances.

 

This is another ridiculous problem Toyota is having they need to get this addressed it seems to be popping up more and more often. I wonder if they updated the cylinder heads on 2023 models to avoid the problem ?

 

my understanding is the 3.5 is used in other vehicles. is this issue occurring just in tacoma's? what is the exact problem that requires the cylinder head be updated? does anyone know?

 

Thank you for sharing about the problem. Makes me more and more certain that I will get the extended warranty on my Taco before the factory one runs out.

 

Not sure but I'll ask the question at the dealership tonight. I have a meeting with the Service Manager, Tech and, the Service Advisor...

 

The issue is on the exhaust side, not the intake. So the slight build up you see has nothing to do with your problem and a catch can wouldn't have done anything to change that.

 

Stuck piston rings? Saturn owners are very familiar with MMO soak to unstuck the piston rings.

 

I've done some searching and I have only seen this problem pop up in the Tacoma from my searching. I have no idea why.

Edit: seems like technicians have found it in the Highlander also, that just did not come up in my searches. I don't know why the other 2GR-FKS models haven't had the same trouble.