P0171 Question

kaloman

New member
Wassup everyone,

This is my first real post and I appreciate all the help! I recently went to a dealership, which diagnosed a P0171 bad O2 sensor. So I replaced it. The check engine light went away and came back a week later. I ran the diagnostics and it again said P0171, but now system lean, bank 1. I've been reading that this may be attributed to a dirty or bad MAF sensor, so I took it out and sprayed MAF sensor cleaner on the wires and bulb. I gave it a good wash. Reinstalled, and within a few hours, the light was back on again. Could this be a bad MAF sensor which needs to be replaced? My 2000 4runner has 143,000 miles and I do not believe I've ever replaced the MAF sensor.

Also, when I was cleaning it, I noticed that the temperature bulb was extremely dark and didn't at all get clearer or translucent when spraying. I wasn't sure if this was normal. The other two wires appeared to look cleaner, but heck, I'm thinking it just may be the end of it's useful life.

Thanks
Kaloman
 
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Wassup everyone,

This is my first real post and I appreciate all the help! I recently went to a dealership, which diagnosed a P0171 bad O2 sensor. So I replaced it. The check engine light went away and came back a week later. I ran the diagnostics and it again said P0171, but now system lean, bank 1. I've been reading that this may be attributed to a dirty or bad MAF sensor, so I took it out and sprayed MAF sensor cleaner on the wires and bulb. I gave it a good wash. Reinstalled, and within a few hours, the light was back on again. Could this be a bad MAF sensor which needs to be replaced? My 2000 4runner has 143,000 miles and I do not believe I've ever replaced the MAF sensor.

Also, when I was cleaning it, I noticed that the temperature bulb was extremely dark and didn't at all get clearer or translucent when spraying. I wasn't sure if this was normal. The other two wires appeared to look cleaner, but heck, I'm thinking it just may be the end of it's useful life.

Thanks
Kaloman

Did you get the wires on the inside of the MAF clean and not just the wires/bulb thing on the outside? A lot of people make the mistake of thinking it's just the outside part you clean so I wanted to make sure you cleaned the right part first.
 
Thanks for the help fellas.

fightman80, I checked out your link and it put me over the edge to just go ahead and buy another MAF. Hopefully everything works out.

kball, I made sure to not only spray the bulb, but also the two hot wires inside the housing.

Thanks!
 
O2 Sensor replaced - Check!
MAF Sensor replaced - Check!

P0171 Engine Light back on - Check!

Okay, so I just replaced the MAF last night and this morning after driving about 15 miles and right after filling up gas, the infamous CEL is back on again and pulling up the same P0171 (System too lean - Bank 1) code. I'm not sure what to do next. Do I need to drive the thing a little longer for the computer to relearn? I just erased the code a few minutes ago.

Any ideas? Man I hope it's not a fuel issue.

Thanks!!
Kalo
 
aw motherfugker that sucks man i have p0171 too check all your vacuum lines because the lines are after the maf so if there is a leak and the computer aka maf doesnt know i will throw a code doesnt matter what you replace
 
t4r4life - I will check the hoses! At 143K miles, I don't think it was a bad thing though to change out the MAF and O2 sensors. Call it preventative and predictive maintenance. haha
 
Okay, so here's an update. So I changed the hoses and the light still came back on. I finally found out that I had a dirty throttle body. So I bought some cleaner, sprayed the bejeezus out of it and cleared the code. Code stayed off!

Now here's the kicker, the CEL (P0171) comes on only after I fill up a full tank of gas. Once I burn through a gallon or two, it goes off. Cycle repeats itself on the next fill up.

How do you diagnose this? Dirty fuel filter? Bad pump?

5th Gen 4Runner is looking pretty good haha
 
You may have the same problem as alot of 3rd gen. owners like myself but when I fuel up and like others they always get as much fuel in as possible and this cause the excess fuel to leak into the carcoal/evap canister throwing a code so next time you go to the pump once its kicks you off from fueling leave it and see if the CEL comes on if not then thats what it is doing and if it does then IDK...but another thing about over fueling is it will eventually damage your EVAP canister and thats a 480 dollar part just FYI
 
Damn, just filled up today and pressed it one additional time after stoppage. I gotta check to see if there is a way to test the evap canister.

Thanks!
 
Damn, just filled up today and pressed it one additional time after stoppage. I gotta check to see if there is a way to test the evap canister.

Thanks!

I dont have a diagram or a write up on how to do it but my EVAP canister is bad but I know my sensor for it are good if that makes sense. I checked the switches for it under my hood I believe there is 2. I had my buddy help with this but you could prolly do it yourself. Take one of the sensor outs and get a piece of speaker wire or any wire of that type put it on the positive battery post and the other end on the valve and blow into it and if air goes thru then its good. Take the wire off of it and try to blow through it and if no air flow then your switch is working perfect do the same to the other switch and if both are good then its more likely the canister by the gas tank. If you want to see if the Canister is bad you can take it to the dealership or any shop probably and do a smog test on it and see if its bad. I hope this helps and doesn't confuse you to much and ANYONE can feel free to elaborate more or tell me if its completly wrong.
 
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WTF is this it has nothing to do with the topic at hand
 
Admin, please delete this Topix by weimingqq it is a spam.

@weimingqq if you are trying to spam on this forum take your post and posted somewhere else not here in the T4R.org
 
so typical, no followup.

this is got me frustrated too. I've had a fuel injector or multiple ones, leaking fuel due to bad O-rings. One came apart when I pulled the fuel rail which I think was the main culprit. To not take any chances, I bought a remanufactured one and replaced all 3 O-rings. Truck is running much better and fuel smell is gone :trophy: but of course the dreaded CEL came on. Pulled this same code and the moron at Autoparts tried telling me it has to be one of my O-2 sensors despite it reading system lean.

At the same time I did the o-rings I replaced my PCV valve n grommet and the Air filter and I noticed that original air filter I was replacing was in backwards.:mad2::mad2::mad2:....so now I can only imagine how filthy the MAF and throttle body are. Truck has 188,000 miles n i just got it in January. My plan is to clean the MAF n Throttle body tomorrow, resit the EFI n battery. I'm hoping that this is enough and that there is nothing else! When I have more time I'm going to sea foam, oil change, fuel filter, spark plugs n wires and finally prey that I don't end up with this dreaded CEL!

What do you think is causing your code?
 

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