P0155 P0135 Diagnosing O2 Sensor Heater circuit, heated oxygen sensor

In this video I give a demonstration on how I went about troubleshooting a P0155 P0135 heated oxygen sensor, heater circuit diagnosis

[@joemikos9155]

Thank you for taking the time to make these videos. Your description of testing O2 heater circuit was very clear.

[@LisaDnColt45]

I wish I had found this video before replacing the whole throttle body assembly but I am sooo thankful for this channel!

[@jgouldsmith]

Great video. Helped me diagnose the problem on my truck.

[@whyso8996]

This is a great video for the home mechanic who may be encountering this problem for the first time and may not be too familiar with using a multimeter and testing electrical components very clearly explained so you can go ahead and diagnose adding more diy knowledge, many thanks from the UK

[@dvmartel1]

This is extraordinarily helpful and exactly what I needed to know in helping me understand what the PO0135 code issue is with two of my 6th gen Civics.

[@stuzman52]

Good video Will. Just wanted to point out that when you do a voltage check on the O2 sensor supply volts, you really need a load on it to verify that all the connections starting at B+ would be intact to the sensor. This would also include the relay contact which would be the most likely problem if there was an issue in this circuit. Thanks again!

[@danielandujar5479]

Best explanation for me!! May God bless sir !! Stay safe! Sir is for respect!👍

[@estrelladelnorte1308]

very nice i really like that you show the diagrams on the corner as you explain.

[@bigtextrucker245]

Even though it's from 2013, I greatly appreciate you posting this video. I have a 96 Astro that both Bank 1 and 2 O2 Sensors that have gone out as well. But it has been sitting along time and getting it running again. Definitely will be using the tips!

[@B.Miranda94]

Great video man, helped me out for troubleshooting and taking care of my engine check light. Cost me about $50 for the sensor and 1hour of my time. Had I brought it to the shop I probably would've had a bill of $150 or more. Thanks a lot! You got a new subscriber!

[@byjiminychimminyrimm]

No nonsense and simple to understand .. Cheers dude

[@stuzman52]

Hi Will! No problem as I knew you knew this already and figured you was going for speed as you pointed out with the open heaters.

[@robinsonsauto]

Thank you, im glad the o2's came right out, not to bad to get at either, thanks for stopping by, hope all is well, take care

[@robinsonsauto]

Good point thanks for mentioning, wish I had more time while performing this repair, I usually load the circuits in question with a test light, “bulb” style not LED if it lights the bulb nice and bright most times all is good, in hind sight I should have demonstrated that, however I had a feeling the heaters were open and went straight for the DVOM, if the resistance was ok then I would have loaded the circuit, in addition to checking the controlled ECM ground at the o2 harness, thanks again

[@katun1368]

Well and simple explained thanks for the info.

[@robinsonsauto]

Thank you for the feed back, i was hopping that little extra editing would help out

[@paulromero2572]

Thank you very much, great help. You are avery good teacher !

[@robinsonsauto]

Thank you, glad i was able to contribute,

[@gbachmura]

Thanks for the video. Question, if a vehicle has the same two codes but the o2 sensor heaters test good, then what is the next diagnostic step?

[@redsson6669]

great job explaining the test.

[@robinsonsauto]

Thank you , yea the pico is a great scope i would like to pick up the automotive kit whenever the budget allows lol needless to say i will be using my old bench top scope for awhile, i have used it on a couple Hyundai's on those i could monitor just about anything i tried, didn't go to deep with them just whatever troubleshooting they needed at the time, keep in mind i have the enhanced AutoEnginuity so that makes all the deference, now if you just pick up the basic generic its very limited

[@ralfvalcourt9187]

Resistance Test is Not always conclusive, resistance changes when hot can trigger the check engine light.

[@scrunchymacscruff1244]

heat-related issues must be considered everytime!

[@haileyweaver6727]

I totes need to know what if it's not showing the open circuit.... it's not my sensor..... can you help me troubleshoot past that point... on my 08 mercury Milan

[@SonNguyenvan-yc1dr]

I'm an auto engineer, can I ask the sensor I changed the wire to the box without breaking or leaking.. can you tell me how to fix it with error code p013

[@jorg0370]

Thanks for the tutorial!

[@SotoAdvert]

well detailed explained

[@amused2deth]

My sensors are brand new. Would it be the relay then? I replaced them this month and it ran fine. Got in a wreck and got my truck back today. Engine light is on and my scan tool gave me these codes.

[@magogomez7664]

What type of scanner is that?pleas let us know.i use launch right now.and I was wondering about pc diagnostic types

[@DJ-tn7vj]

Yo Rob,do you have any videos with P0420 diagnose. Yeah that code. Want to find out why keep getting this code on various cars. Just don't wanna install the cheat code adapter without finding out why it throws the code with good fuel trims.

[@Effay513]

Great vid as always, Will. Thanks!! This is my tv, lol.

[@atomizerplus2051]

Great video!!

[@AutoTechTeacher]

Robinson, what program are you using on your pc? I am looking into data programs. Thanks

[@1elAguila]

great vid will i just did one of those O2 take care amigo

[@ralfvalcourt9187]

Great Video!! Now all you have to do is get rid of that silly scan tool software.

[@robinsonsauto]

Thank you

[@265chevy]

good video

[@junglejim13660]

Will, Great video as always. I'm a new subscriber-where did you get those flexible alligator clips?

[@Mikeyddread]

How to check the heated circuit wire from the o2 to the computer

[@d-i-ymech1016]

what is p1273 circut lean shift means please can someone help?

[@robinsonsauto]

Thank you, they came in a set i purchased at radio shack awhile back, in addition to many other attachments as well, very handy and well made, on my website forum we started a topic on that set awhile back when i was doing an electrical series, including pics, toolsandtime. com forum

[@robinsonsauto]

Thank you sir,i appreciate that, like wise i went to approve your video response however i couldn't find it in my mail/video response folder, i would be more than happy to add if you would like to resend

[@wazup3333]

robinsonsauto mine has multiple red conducters and in the sensor side there is only 1 black conducter and 2 white conducters. The one black looks like it has 2 prongs

[@simonflores3410]

How do I check a 3wire oxygen sensor on a 94 chey. Trk. 5.7 2500

[@ralfvalcourt9187]

3 Wire uses body ground. Do a Google search for diagram

[@robinsonsauto]

i used the kiss method on this one lol thank you

[@tragichero7746]

Tune up on this motor is fun. Lol

[@randyy1964]

My stupid svc manual says black and pink wires are the hots. I have 2 white a purple and an orange. Fuck me.

[@robinsonsauto]

Very true lol

[@Case_]

Calling an open circuit "open loop" is not a good idea when working on cars, especially on oxygen sensors, since the term "open loop" or "closed loop" has a completely different meaning. It's only going to confuse people.

[@dianefalvey1293]

how does it have a different meaning in a circuit, a DC circuit mind you, if you have taken physics you will see that Kirchhoff's rules states current in and current out in loops must be equal. A circuit is a loop in Lehman's terms.

[@Case_]

Yes, a circuit is a loop. It still doesn't change the fact that the terms "open loop" and "closed loop" have a very specific meaning when it comes to engines and would best be avoided to prevent unnecessary confusion. BTW, I'm a certified high voltage electrician by trade. Well, originally. So yeah, you can say I've taken physics.

[@robinsonsauto]

Thank you

[@robinsonsauto]

Thank you