You should always make this a practice. Change both O2 sensors at the same time.

Is the vsv functioning to spec on the charcoal canister?

Check fuel cap too.

 

Live data looks good for the second O2 sensor it's in spec. VsV?? You mean the vacuum control valve?
Have not checked gas cap, will try that in the morning

 

Your long term fuel trim is pretty high. A lean fuel mixture can cause the high LTFT demand as well as set a lean code.

Unfortunately that gets a bit more complicated to check. Fuel pressure test, volume test. Injector clean.

 

Its getting colder again which means your intake gasket is almost guaranteed to have failed. All original intake gaskets on these fail eventually. Many were replaced with the same original gasket and will fail again. The intake gasket leak is almost never detectable with conventional methods of spraying around the intake.

Fix is below:

DIY 2003-2008 Corolla, Matrix, Pontiac Vibe Intake...

Well I am up here in Virginia for a little while and it's been pretty cold. The past few days my idle has been very low and I knew my original intake gasket had run its course (104k is alright with me). So I headed over to Priority Toyota and spent around 7 bucks and change to get an updated...

www.toyotanation.com

Replace the gasket and report back.

 

I dealt with this issue for a long time before I found the fix on my 2003 LE (was around 275,000 when this issue came up). I was getting a P0171 and a P0420 at the same time.

So here was the process of my fix:

1) Replaced O2 sensors - this did not solve the problem, but was done since the old ones were original and I wanted to rule them out.
2) Replaced cat. converter with a Walker replacement. This resolved the P0420 code, but the P0171 still persisted.
3) Since I had already replaced my intake manifold gasket with the updated one years ago, I then ordered 4 new injectors and that's what solved the P0171. The injectors I removed were very clogged with an oily residue which was obviously restricting flow. I probably could have done an injector cleaning service, but I found 4 injectors for less than $100 so it was easier to just replace them. I expect that this residue was caused by a failed PCV valve (since been replaced) allowing oil vapor into the intake track.

I hope this helps. Post back once you find a fix.

 

Installing the intake gasket today. Also gonna clean my injectors. I'll let you know what happens. Thanks for the advice

 

Alright. It was a little slow today so I had time to work on the car. I replaced the intake manifold gasket, valve cover gasket(it was leaking into the plugs), replaced spark plugs, checked and cleaned injectors. Just ran the car for a while. About to drive around to check out if the light pops up. Also cleaned the MAF again..

 

Maybe this was where I got confused "checked and cleaned injectors", if that was the case then the injector cleaning COULD have solved the problem. The removal of the oil surrounding the plugs COULD have solved the problem. The plug in the picture doesn't look that bad to me. Not confused now, I think? Thanks.

 

It was the fucking plugs. Just passed smog

 

I'm confused, you did several things which fixed the problem, how can you say it was the plugs? My thinking was the injectors were your problem and I normally suggest techron FIRST, before replacing other things. I have used techron alone to get rid of that code, without any other action the code was gone in 50 miles, cleared itself. That to me is convincing proof that the injectors were the issue, since they get gunked up over time naturally.
That code is for a random misfire which jives with poor spray patterns on the injectors. Maybe I missed something?

 

P0171 is a lean code not random cylinder misfire. When I went to address the separate issue of the leaking valve cover I discovered my spark plugs were drowning in oil. This made me check the plugs and came to find them like this(pic). They were garbage from most likely being run for too long with the p0420 code and a bad O2 which made it run lean till they failed. And yes bad plugs can cause a P0171. When checking and cleaning the fuel injectors they were fine so that's why I'm certain it was the plugs. So simple I over looked it and found the problem by accident.

 

Unless the electrode is getting hot, that can lead to carbon build up instead of burning during the combustion stroke.

Pull the plugs again and inspect the top of the piston for carbon build up. Have a suspicion you have build up there. Seafoam treatment will remove those deposits.

 

Platinum, iridium and ruthenium plugs tend to look fine and not visibly wear like other types of plugs (copper especially) They still go bad though. And yeah bad plugs technically make the car run rich but can command the fuel trims to the point where it codes lean instead.