Oxygen Sensors 101 - Testing O2 Sensors for Resistance and DC Voltage

[Scan Tools]
CHEAP bluetooth scan tool: amzn.to/30Alycj
Scan tool (No phone required): amzn.to/30C0IJC
[Recommend Tools]
Cheap Multimeter: amzn.to/2Oh68Hy
Crocodile Clips: amzn.to/30AxCu5
Propane Nozzle: amzn.to/3eJ8REv
Chapters:
0:00 Intro
0:15 The Purpose of This Test
1:02 What is an O2 Sensor?
4:20 Types of O2 Sensor
5:10 Test Heater Element for Resistance
6:54 Test for Voltage
--------------
Oxygen Sensors 101 - Testing O2 Sensors for Resistance and DC Voltage
SUBSCRIBE FOR MORE!
#OxygenSensors #O2Sensors #LambdaSensor
--------------
[Graphing O2 sensors]
We want to graph the UPSTREAM oxygen sensors for performance issues. They produce voltage between 0 and 0.9 volts.
We want to graph the DOWNSTREAM oxygen sensors to check the efficient of the cat. They produce voltage between 0 and 0.9 volts.
High graph/voltage - RICH (Too much fuel, too little air)
Low graph/voltage - LEAN (Too much air, too little fuel)
Erratic graph / No graph / no voltage - Failing O2 sensor
[How Many? - TYPICAL Example]
A V6 has 6 cylinders, with 2 cylinder heads. A cylinder head groups a row of cylinders, so 3 cylinders per head in this example. The exhaust manifold captures the exhaust as a result of the engine combustion at each head. So on a V6, you have 2 exhaust manifolds. The vehicle manufacturer decides how this exhaust is processed and exited from the vehicle. It could be combined into one tailpipe, two or four for example.
Usually each exhaust manifold will have it's own set of O2 sensors and a catalytic converter.
So on a V6 or V8, there is typically 4 total O2 sensors.
[How to]
RULE:
- When the car is COLD, the O2 sensors will flat line (not oscillate / no amplitude).
- As the car heats up, and the O2 sensors heat up, the voltage output begins to oscillate until they reach their temperature of around 600F.
1. Get the car to operating temperature. This ensures the readings are accurate. The engine will go into CLOSED LOOP when warm, this is where the engine listens to the O2 sensors to adjust the air/fuel ratio.
2. For performance issues, we want to test all UPSTREAM sensors, so BANK X Sensor 1 (upstream/precat/etc) as these provide feedback to the ECU to adjust the air/fuel ratio based off their voltage readings.
NOTE: The good thing about having two UPSTREAM sensors is that you have a point of comparison.
3. Check the graphs are making sharp continuous sine waves, like spikes oscillating. When giving gas, the spikes will happen MORE frequently and it'll be more condensed. The graph will typically go from 0.01v to 0.9v
[Interpreting the Results]
- The actual engine code gives you the first clue. Is it a low voltage issue? General malfunction? Heater circuit malfunction?
- Solid line can mean a dead sensor or sensor failure (Assuming the car is warm)
- If the spikes are LESS frequent, you have a slow response condition.
- No voltage, dead sensor or wiring (May throw a specific code for this issue.)
These terms are all one and the same:
Front O2 sensors
upstream
Bank X Sensor 1
pre-cat
before cat
manifold
These are all one and the same:
Rear O2 sensors
downstream
Bank X Sensor 2
after cat
post-cat
Example O2 Codes:
P0130,P0131,P0132,P0133,P0134,P0135,P0136,P0137,P0138,P0139,P0140,P0141,P0142,P01403,P01404,P01405,P01406,P0147
Video Title: Oxygen Sensors 101 - Testing O2 Sensors for Resistance and DC Voltage
Video File Created Date: Thursday, 11 March, 2021 (Video may or may not have been captured on this date, it shows the date the video was last converted.)
-- Video uploaded and managed using KZbin Bulk Uploader for the Lazy!
-- Manage and Auto-Tag your KZbin videos offline... Then upload!
-- ginkosolutions.com/youtube-bul...
-- GinkoSolutions.com
Video Tags:
oxygen, sensors, 101, testing, o2, resistance, dc, voltage, upstream, downstream, o2 sensors, oxygen sensors, bank 1 sensor 1, bank, sensor, precat, pre-cat, slow response, o2 sensor, o2 sensor replacement, o2 sensor symptoms, oxygen sensor, oxygen sensor symptoms, oxygen sensor replacement, oxygen sensor bank 1 sensor 2, oxygen sensor cleaning, oxygen sensor test, how to test oxygen sensors, p0130, p0131, p0132, p0133, p0134, p0135, how to, lambda sensors

[@TutorialGenius]

Like and subscribe for more! All parts, tools and more information in the video description. If this video helped you, please support the channel by clicking "Thanks"! We also have memberships to our channel with great perks! kzbin.info/door/0HkS2-1Tk1ULQJj3uGbjdwjoin Thanks for watching!

[@keithhoneycutt3874]

looking for a video to test the vehicles wiring harness that attaches to the o2 sensor.

[@username3864]

This was interesting and enjoyable to watch even though I already know what an O2 sensor is and how to test it... Straight to the point with a simple (but not dumbed down) explanation and a very good demonstration.

[@philtolfreeart]

The opening explanation of open and closed loop was really helpful! Thanks mate 👍

[@TutorialGenius]

No problem 👍 Thanks for watching!

[@francisdsa6790]

Very good explanation and demonstration information thanks 🙏👍👌💐

[@mikeschnekser9237]

Nice video. It cleared things up for me. Thanks.

[@TutorialGenius]

You're welcome!

[@francoisoosthuizen6663]

Great explanatory video. Thank you

[@TutorialGenius]

You are welcome! :)

[@pjwoo276]

You hit on so many details and important points it gave me goosebumps. I think I need a cigarette now. 😆

[@TutorialGenius]

hahaha! 😆😆

[@fookutube501]

Thank you for sharing .I have 2 question,I tested my 2 white wire from the heater and it read 00 ohms(even when its running),also tested signal and ground and it reads 1 volt,would this be consider as a bad sensor?. I also tested the signal and ground from the ecu and it reads 12.4 volt is this too high?....

[@renejacques8288]

I bought four O2 sensors, and two of them test at 4.7 Ohms. Are they good? Thanks for the video.

[@AdamsGarageComp]

I have a 5 pin upstream O2 sensor that’s reading 86 ohms. Does that mean it’s bad?

[@rihovaher]

The best way to remove the lambda sensor from the cast iron exhaust manifold is to heat the cast iron manifold near the sensor from several sides, if the sensor is broken, cut the wire and carefully unscrew the sensor with a long hex key, if you use a split key, which is more suitable for installing a new sensor, you can turn the edges of the sensor round.

[@dognatious6153]

Watch dozens of videos this is clear and easy to understand. 😊 And a great video and sound quality.

[@TutorialGenius]

Happy to hear that!! :)

[@SuperTurboAE111]

If you measure the other 2 wire (not heater side) in Ohms, what will you get while it's still cold?

[@kraignadjkovic5494]

Open.

[@thedillestpickle]

Why would it bounce up and down in a sine wave? That seems odd to me. Shouldn't it put out a constant voltage under constant conditions? Wouldn't the sine wave be due to adjusting trim of the engine? Also, I wonder if getting it red hot with a torch doesn't do permanent damage to the sensor. I don't recall off the top of my head, and I'm not sure if you are talking C of F, but I'd think red hot is way hotter than 600 degrees.

[@TutorialGenius]

I'm sure this website can explain it in far better detail than I can and willing to allow time for haha! autoditex.com/page/lambda-sensor-o2-sensor-21-1.html#:~:text=If%20the%20sensor%20is%20working,will%20be%20around%200.45V.

[@geraldwegener8376]

Is it necessary to remove the O2 sensor from the vehicle or can the test be done with the sensor in the exhaust ?

[@TutorialGenius]

If you have an OBDII scanner, yeah sure, you can look at the voltages. I mentioned in the video too

[@geraldwegener8376]

@@TutorialGenius Thanks! I found the problem... bad connection at the O2 sensor. I cleaned the connector and working perfect !

[@randy1ization]

bought a new 3 wire o2 sensor and the resistence is 0.0 ohms.

[@Guts33]

Hi, what about a car with a rich condition, and the o2 is always about 0.285 V to 0.305 V? Do you think the O2 is faulty?

[@TutorialGenius]

oxygen sensor, MAF, fuel injector leak, vacuum leak, fuel regulator.... many things! What are the long and short term fuel trims saying?

[@Guts33]

@@TutorialGenius Hi thank you for answering, replaced MAF, and the injectors too. at idle the long term fuel is -4.688, short term fuel trim bank1: -14.062%, and short term fuel trim B1S2: -%. The car had a P0507 that got resolved cleaning the throttle body but the idling is still bad, and planning to replace it soon. The car has no codes. O2 sensor B1S2 is always around 0.3V, and O2 sensor B1S2 moves from 0.3 and 0.4 V The car is a Sentra 2005 1.8S

[@louiseeustace422]

Please stop moving.

[@TutorialGenius]

I like to move it move it

[@bjhachannel6747]

You talking so much bro

[@TutorialGenius]

That's why we have teachers and McDonalds workers in this world. You have chosen your path already

[@bjhachannel6747]

Omg only test 1 sensor you're talking so much bro ur suck video bro

[@TutorialGenius]

That's why we have teachers and McDonalds workers in this world. You have chosen your path already