1998 4Runner, O2 sensor circuit malf

[atlanta1980]

Sorry if this is a repost, but i'm new here. Mod, please move, as necessary.

I have a 1998 4Runner with about 190k on it (though its an aftermarket engine with only about 90k). Runs pretty good for an old machine, but i just failed emissions. My dad was the kind of getting stuff fixed, but he passed away a few months ago, and i guess i didnt learn as much from him as i really shouldve.

I was wondering if yall could give me a little guidance. I looked up some of this stuff online, but they referenced things i wasnt familiar with; I was hoping i could get a pretty clean step by step for someone that doesnt know a ton about cars. From what ive read, I feel like I could handle the replacement of the sensor ok, but i dont wanna get under the car without knowing what i'm doing.

Toyota
4Runner
1998
6-Cyl, 3.4 L
Auto


i heres the printout from the emissions:

RPM = 7499
KOEO = Pass
Readiness = pass
MIL CMD = Fail
Codes Read = 02
DLC = Pass

DTC1 = P0130 - O2 Sensor Circuit Malf (Bank 1 Sensor 1)
DTC2 = P0133 - O2 Sensor Circuit Slow Response (Bank 1 Sensor 1)

 

[yotachief]

So it sounds like you need to replace your bank1 sensor 1 O2 sensor. This sensor is the first sensor before the cat in your exhaust system. With basic hand tools you can replace it. It would be a good idea to soak it down with some rust penatrant before you try to take it off. I recommend to get a sensor from Toyota although they are pricy. Once you have the new sensor in disconnect the battery for about 1 minute. That should clear your check engine light and any codes you may have.

 

[T4R2014]

See this thread. There is a thread in there that is all about this topic and many more.

Rule of thumb with oxygen sensors on 4Runner's is to stick with Denso only. Also, Amazon has the best price for them most of the time.

 

[atlanta1980]

how do i know which is right? they all have different numbers; even the denso ones. i put all my vehicle information in.

1998 Toyota 4Runner: Oxygen: Part Finder: Automotive: Amazon.com

 

[kball]

I wouldn't trust Amazons part finder. It's often wrong. Use these two sites to find your part. You listed everything I would need to find it except if you are 2 or 4wd.

DENSO Auto Parts |

Oxygen / AFR Sensors - Underdog Racing Development

 

[atlanta1980]

ok, so i got the part (confirmed with a toyota dealer) from amazon and found the right sensor and put on the rust penetrant and let it sit for a bit then went to grab my socket wrenches, only to find that either i dont have the right tool or the rust is making it too hard to grip.

either way, im stuck for now...any suggestions? i looked online and saw some special sensor removal tools, do i need one of those? any direction for that?

thanks in advance