Agrinja

Hi all,

My engine light came on recently and I'm getting three codes:

P0456 - EVAP system very small leak detected
P2238 - Air Fuel sensor pumping current circuit low 11
P2241 - Air Fuel sensor pumping current circuit low 21

Anyone ever run into these three codes together? I've done some research into the air fuel sensors and it seems like they are easy to replace (except the cost!). One of the probably causes for P0456 is fuel cap. Could these three be related? Can I fix one and have it take care of the others, and if so, which do I try first?

I was thinking about replacing the fuel cap first, just to see what happens, but if there's little possibility that will help then I won't bother.

Any help would be appreciated!!

tovyaweiss

I also have a 2003 es300 and getting code p2241. I'm having trouble figuring out the location of it and what to buy to put new one. Is it the one right up front drivers side on manifold and when buying is it the one called upstream front ? It's been confusing.

hkfool

Hi all,

My 2003 ES300 with 280K miles has the CHECK light on. My OBDII/DTC told me that I had P0420-Catalyst system Efficiency Below Threshold (Bank 1).
So I did the followings:
1) Used my heat gun to check the temperature on my Catalytic converter before (~350-400F) and after (~400-450F), which indicates the CAT is working.
2) Replaced all my spark plugs.
3) Disconnected my battery connections, cleaned all 4 sensors' connectors and changed all of them with the original parts including Bank 1 A/F Senor 1 (PN#:89467-33060), Bank 1 O2 Sensor 2 (PN#:89465-33260), Bank 2 A/F Senor 1 (PN#:89467-33050), and Bank 2 O2 Sensor 2 (PN#:89465-33250). Now, I have P2238 Oxygen Sensor Pumping Current Circuit Low (for A/F sensor) (Bank 1 Sensor and P2241 Oxygen Sensor Pumping Current Circuit Low (for A/F sensor) (Bank 2 Sensor 1) on my OBDII/DTC. So I googled the web, someone said there is some short circuit in my sensors but what should I do?
4) Checked my Fuse #2 A/F, which is okay because it's not open circuit.

Thanks in advance if any help or suggestions! I do appreciate !!!

ArmyofOne

Man I am struggling with these 2 codes too. 2238 and 2241. I have NO IDEA what to look at, and I have been a tech for over a decade. These are tricky codes. It says O2 sensor, but in reality it is probably a misfire (at least in my case).

hkfool

Thanks again ArmyofOne, Like I mentioned before, I have already replaced all my spark plugs. Unless I have a bad spark plug wire triggered this 2238 caused by misfire. Actually, I only one 2238 for my Bank 1 A/F Senor 1 (PN#:89467-33060) now because when I put my old Bank 2 A/F Senor 1 (PN#:89467-33050) back, it clears the 2241 code. When I have P0420-Catalyst system Efficiency Below Threshold (Bank 1), I thought my sensors were too old anyway, so I bought four new sensors with the same Toyota part#s to replace them. It turns out if things not broken don't touch it always right. I should ONLY replace Bank 1 A/F Sensor 1 not the other three sensors. It looks like I have a bad brand new A/F sensor, which I don't want to spend extra money to buy another sensor to try it again.

ArmyofOne

Here is what I am doing. I purchased every part that could cause the code to pop up, and I am replacing them one at a time over a period of weeks. Since the car is my daily driver but I have 2 others, It is not a big deal to me if its down for a day while I work on it. I got on amazon last week and ordered the Bank 1 and 2 upstream O2 (also known as Air/Fuel) sensors, Intake manifold gaskets, Throttle Body Gasket/screen, PCV Valve, MAF sensor, 6 coils, 6 Denso Iridium plugs, some anti-sieze, some freeze-off penetrating oil, an O2 sensor removal tool, valve cover gaskets, and spark plug o-rings.

I changed the MAF on friday, and cleared the codes. I have since put 200 miles on the car, they have not come back, and I noticed an immediate improvement in drivability. Be that as it may, I am still going to replace the rest of the parts I ordered because even if they aren't bad yet, they are old and should be replaced. The plugs were last done at 89k when the timing belt was done, the PCV Valve has never been done, the valve cover gaskets were done at 40k, and the other stuff to my knowlege has never been touched, and the car has 161,000 miles on it as of yesterday.

cpbouver

Yeah, call your nearest junk yard then drop it off while your ahead. Don't waste your money on it like I did. Money pit, and you will never get it back.

Oro

I used to be a moderator at ToyotaNation (before the owner went left-wing weird conspiracy wacko and promoted 9/11 conspiracy theories, and also ran an "eyes only" private **** forum for moderators - just too f'ing wrong...). Anyway, one of the privileges, besides providing advice to people and being helpful, was just shutting down thread-cr$$ping like this before it wasted other peoples time. Maybe ClubLexus needs more moderators...