very helpful, but do you have a video of replacing the other sensor? i have to replace one of my 02 sensors but since i dont know which one is bad i have to do both
Hello there! I didn't need to replace the Bank 1 sensor 02 on this vehicle (atleast not yet). But if you just follow that pipe the second 02 sensor will be on it. I changed out Bank 1 sensor 1 which is the closest to the motor. The Bank 1 sensor 02 will be just a few more feet down the pipe. I did trans lines on one and you can see the 02 sticking out of the pipe at about ruclips.net/video/m5smtn5Gy58/видео.html 4:43. Its on the far left of screen. That would be the 02 sensor for bank 01 sensor 02.
@@drag0ns1ay3r7 Best of luck on the job. Thanks for watching my video :) If you can heat up the car first they come out much easier but you do risk burning yourself. You can try with the car cold first. Just be careful as always!
I Scan my 1998 blazer today and Got code P0135 .bank 1 sensor 1 heater circuit. Is this O2 sensor located upstream on driver side or passenger side? Any help is appreciated.
Sensor 1 is upstream before the catalytic converter. As for driver or passenger it’ll be on whatever side has cylinder one . On the 4.3 that would be the drivers side . Just google 98 blazer cylinder order and confirm your motor to see which side cylinder 1 is on .
Hey John ! You are right . I did use my scan tool to look at live data and the sensor was not giving me readings even after I confirmed it was plugged in . Since not everyone had a good scan tool I didn’t want to do a tutorial on that. But in our case we confirmed it was out of spec. After replacement code never same back .
2005 trailblazer ext ls 4.2 i have a po420 code bank 1.. i changed the cat 3-4 years ago... do you think it could b a bad o2 sensor or the cat is bad again??? Last time my cat was bad i had extreme loss in power and acceleration... i dont have that now its the same as always ??? Any help would b highly appreciated
In our case for the bad 02 we felt no performance issues maybe some mpg loss. If you have a scan tool you can check the 02 sensor voltage and it may show if it’s completely failing or not . At the cost of the 02 vs a new cat if you are going on a budget I would suggest the 02 sensor first . Unless your car gas been running very rich I would be surprised the cat would fail so quickly . The p0420 means that both 02s are reading the same values which given a cat is between them it shouldn’t . So it’s either an 02 is malfunctioning or the cat is no longer filtering properly . Again it would take some checking with a scan tool but if you don’t have one and don’t want to pay a diagnosis the 02 is a cheap try .
@@JustFixinGarage i have a scan tool but not a live data tool. Ive used chevron and valero gasoline in mine cat was replaced not long ago so doubt its that just going to replace both o2 sensors... 173xxx miles on car have had for 5 years .. no loss in performance that i can relate to the old cat going out.. have loss in mpg so hopefully its the o2.. have felt all around manifold to exhaust and no leaks that i can feel or see
@@NORCALPYRO_ I am sure you would hear a leak as well. The vehicle in this video has over 200k miles and I dont believe they have had to change the CAT yet so unless somehow you got a defective one I think starting with O2 sensors are the best bet. I know it sucks throwing parts at a problem but if the cost for diag is the same as the parts I will take the parts EVERY time. Best of luck Ryan!
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*Thank you very, very much!!* Bigtime help, Im on a tight budget & this is what code kept coming up. PO- 300 Misfire
Very helpful. Many thanks
Glad it helped!
A local shop replaced ours way back - just wondering what it was about! thanks
THANKS HELPS ALOT
thank you for sharing
Thanks for the SUB!
very helpful, but do you have a video of replacing the other sensor? i have to replace one of my 02 sensors but since i dont know which one is bad i have to do both
Hello there! I didn't need to replace the Bank 1 sensor 02 on this vehicle (atleast not yet). But if you just follow that pipe the second 02 sensor will be on it. I changed out Bank 1 sensor 1 which is the closest to the motor. The Bank 1 sensor 02 will be just a few more feet down the pipe. I did trans lines on one and you can see the 02 sticking out of the pipe at about ruclips.net/video/m5smtn5Gy58/видео.html 4:43. Its on the far left of screen. That would be the 02 sensor for bank 01 sensor 02.
its actually visible in a few parts of the video but I didn't have to remove it.
@@JustFixinGarage oh man thanks a ton your a life saver!
@@drag0ns1ay3r7 Best of luck on the job. Thanks for watching my video :) If you can heat up the car first they come out much easier but you do risk burning yourself. You can try with the car cold first. Just be careful as always!
@@JustFixinGarage got the sensors changed and the issue is persisting
I Scan my 1998 blazer today and Got code P0135 .bank 1 sensor 1 heater circuit. Is this O2 sensor located upstream on driver side or passenger side? Any help is appreciated.
Sensor 1 is upstream before the catalytic converter. As for driver or passenger it’ll be on whatever side has cylinder one . On the 4.3 that would be the drivers side . Just google 98 blazer cylinder order and confirm your motor to see which side cylinder 1 is on .
@@JustFixinGarage thanks a lot. I will be changing it tomorrow. Hopefully old O2 it's not seized up . My 98 blazer is a 4.3 engine.
@@sar9907 if you can safely do it heating up the car helps but it is a risk of burning yourself as well.
It was a great job putting in that new O2 sensor. But I don't think changing an O2 sensor without testing it is a good idea
Hey John ! You are right . I did use my scan tool to look at live data and the sensor was not giving me readings even after I confirmed it was plugged in . Since not everyone had a good scan tool I didn’t want to do a tutorial on that. But in our case we confirmed it was out of spec. After replacement code never same back .
@@JustFixinGarage just to let you know Ryan I really enjoy watching the show. I'll always be tuned in for more keep up the good work.
@@JustFixinGarage😅😮
*Pro tip: compare the plug ends before you remove the sensor.
I have since done this on the last 02 sensor jobs and its a GREAT TIP! Thanks
@@JustFixinGarage yeah I learned that one the hard way. Thanks for the content! I'd be lost without RUclips repair videos.
I literally hall of the same codes at the same time too with my LS
I did a few videos on this trailblazer fixing several of them hopefully it helps you out.
Mine is just stuck on. Very hard to get off
That one is pretty easy how about a video on the lower stream 02 sensor now that one we could all use help with.
The neighbor still has this truck it could happen :) if it does I will surely film it
This 4.2 liter don't compare near the struggle from the 5.3&6.0 this liter is pretty easy to work on easy access
2005 trailblazer ext ls 4.2 i have a po420 code bank 1.. i changed the cat 3-4 years ago... do you think it could b a bad o2 sensor or the cat is bad again??? Last time my cat was bad i had extreme loss in power and acceleration... i dont have that now its the same as always ??? Any help would b highly appreciated
In our case for the bad 02 we felt no performance issues maybe some mpg loss. If you have a scan tool you can check the 02 sensor voltage and it may show if it’s completely failing or not . At the cost of the 02 vs a new cat if you are going on a budget I would suggest the 02 sensor first . Unless your car gas been running very rich I would be surprised the cat would fail so quickly . The p0420 means that both 02s are reading the same values which given a cat is between them it shouldn’t . So it’s either an 02 is malfunctioning or the cat is no longer filtering properly . Again it would take some checking with a scan tool but if you don’t have one and don’t want to pay a diagnosis the 02 is a cheap try .
@@JustFixinGarage i have a scan tool but not a live data tool. Ive used chevron and valero gasoline in mine cat was replaced not long ago so doubt its that just going to replace both o2 sensors... 173xxx miles on car have had for 5 years .. no loss in performance that i can relate to the old cat going out.. have loss in mpg so hopefully its the o2.. have felt all around manifold to exhaust and no leaks that i can feel or see
Thanks for your reply
@@NORCALPYRO_ I am sure you would hear a leak as well. The vehicle in this video has over 200k miles and I dont believe they have had to change the CAT yet so unless somehow you got a defective one I think starting with O2 sensors are the best bet. I know it sucks throwing parts at a problem but if the cost for diag is the same as the parts I will take the parts EVERY time. Best of luck Ryan!
Taken my car to several shops and no one can get it out.
If I seized in there Chances are it’ll take the threads with it. You may need to consider a new manifold
Didn't show me nothing how to get the sensor out except your body and music while you was doing it. Not useful to me
If knowing how to use a wrench is too complicated take your car to a shop 🤙