ArmyofOne

So the text on the code reader says:

P2238 "Oxygen Sensor Pumping Current Circuit Low Bank 1 Sensor 1"
P2241 "Oxygen Sensor Pumping Current Circuit Low Bank 2 Sensor 1".

I have a stumble, that can best be described as a misfire. Usually happens between gears as the transmission is shifting. I cleared the CEL with my OBDII scantool and it came back less than 20 miles later.

Logic says next course of action would be to replace the O2 sensors...but I am wondering if I should by a set of coil packs and plugs and replace those first. Thoughts?

ArmyofOne

Ok, well, I decided to do it all. Just ordered $300 bucks worth of parts on Amazon. They say if it ain't broke don't fix it, but in this case, with 160k on the clock, if what i ordered isn't broken now, it will be soon. Better to do it all in one fell swoop and be done. I ordered:

-Vacuum Tubing
-Intake manifold gaskets
-Throttle Body Gasket/screen.
-Denso PCV valve
-Set of 6 Denso Iridium Plugs (per the manual)
-Set of 6 coils (Napa brand. I figure for the $67, if they work great. If they don't, then I will send them back and get the Denso's. Because those are like $70 EACH. Its a 15 year old car so...yeah...)
-MAF Sensor (also Napa: gimme a break, it was $35).
-Both Upstream O2 (air/fuel) sensors. I will give you a hint...they weren't $110 each, so they aren't Denso. #nohairdontcare
-O2 sensor socket (because mine is buried at the back of a 10x20 storage unit )
-Anti-seize.
-Freeze-Off penetrating oil to get the O2 sensors loose.

Before I start all this I will likely run to autozone or wally and grab an air filter. I just did seafoam and a Full Synth oil change 2 weeks ago so no need for that.

pacerman

Year, make, model, engine? I always start with the basics. If both codes come back at the same time, usually means theres an electrical thing going on.

ArmyofOne

02 ES300, 1MZ-FE 3.0

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.

fortitude

I have the FSM for '02, I cannot find these codes listed in it?? If you are using the FSM, what page # ?

ArmyofOne

I am not. I am using my OBDII scan tool.

ArmyofOne