midiwall

I understand. My apologies as well - but the guy's just wrong. It may work on some vehicles, not ours.


And that's the illegal part. In fact, tamping with the emissions system (which, by definition, could probably extend to the O2 sensor) is illegal at the federal level.

rabidmonkeyman

alright, so if i replace this, what do i need? you posted the converter but the guy said o2 sensor, and now im just confused

i found this http://www.partsandaccessories.com/o...e=2-dot-4l_gas
im just not sure if i need before or after

and if its the converter then id look at what you showed from ebay

midiwall

Well, the code talks about the cat system not working well. Again, from seeing other people go through this, it could be the O2 sensor or it could be the cat. In an earlier message PF says it's the O2 sensor... Given that this is a 95 and I bet with the original cat, then I'd switch out both.

Bank 1 is the O2 sensor in front. This is a 96 with the 3.4? Check URD:
http://www.urdusa.com/product_info.p...s_id=430006000

URD's $89 is a decent price, Lee pointed out that there are also other vendors here on YT. Drop a PM to a member named "strap22", he's been giving killer prices on stuff.

Do NOT replace the O2 sensor with a generic. It may seem that you can save money, but the Toyota gear REALLY wants to see an OEM (Denso) in there. People have tried generics and had nothing but weirdness.

rabidmonkeyman

actually its a 96 with a 2.4, ill drop him a pm tommorrow once i figure out whats goin on with it (ill prolly burn off all the gas and replace it with 87)

edit: also thanks for all the help you gave me, who knows what i woulda done without coming back here

PirateFins

sorry rabid I thought you said it wa a 95 not a 96 that is why I pointed to the TE1 and E1, yes it is OBDII. I see you got the code and I agree with Midi, changeout the O2 sensor. If you can't get a affordable replacment from one of the members here. You can get an OE one from www.sparkplugs.com.

rabidmonkeyman

the light went off after i switched out the gas, ill let it run for a while then check it again, but i think it may have just been the gas

midiwall

That doesn't make a lot of sense... We're talking about 1 (one) octane point, right? 87 <-> 88?

When you switched gas, did you happen to move to something with more ethanol in it? Different gas station? Any chance for a ton of water in the tank?

boluca

I have been having the same problem.
99 4Runner Limited, v6.
Code is PO171. System Too Lean Bank 1.
Replaced the oxygen sensor with one I picked up from NAPA.
Plugs look good, checked throttle body and it was clean.
Code keeps coming back on. Am I missing something? Could it be another problem.
Truck runs fine and has 77k miles.

midiwall

Be careful about using non OEM O2 sensors. You should only be running Denso's.

Past that...

Air filter, TPS, MAF, TB (you covered that though), fuel filter.. Did you search for what other folks have done?

Where are you in the world? (I'm asking to get an idea of elevation, weather, etc)