Auto Repair: Oxygen Sensors - Testing and Replacing (1 of 2)

[SaM5246iPhone]

can't you also use brake cleaner sprayed on a rag and cover the front of the plug with the moist rag, it should not detect any oxygen, i saw this in another video on youtube

watch?v=1mb4VmDd0ao

[hp11208]

p0031 on my mazda mpv

[txfirehawk]

Thanks!

[leonardphill25]

This video went viral on Switzerland

[EchoWanetaih204]

hiya nie mehr schuften bin so reich

[fackyoutoobe2]

Thank you for helping me find the proper voltage to bypass my sensors now I can inspect my car for chap yay

[MrVincegg25]

those of you immature idiots writing garbage why don't you just stay out and let us who enjoy learning so we can make a living , continue to receive help from these gentlemen

[5am8011]

we sure didly do neighbourino 0:36

[3OOOGTVR4]

these guys ass fucked after this was made



[friedchicken1981]

@3OOOGTVR4 hahahaha XD

[kc2sho]

Why does he specify a digital volt meter? Volt are volts, digital vs analog meter doesn't matter.

[hkbballboi]

@kc2sho

Quote from ehow.com

"Digital voltmeters are the best way to test O2 meters as they can register a very low voltage and do not detract voltage due to a low volume current. Do not use non-powered analog style voltmeters.

"

[StaggeredW]

@kc2sho Actually no, It's because of the accuracy of an analog meter. And people not understanding how it works. Example being, if you have the leads wrong in the meter on an analog and take the measurement the arm will swing left and mess up the meter, not get a reading, and other things, on the digital meter you will get a reading but it will say -volts. Also measuring very small differences in voltage is easier with digital... meaning seeing .9volts vs .8 or 1.0 is all in perspective.

[rulas702]

my 07 avalanche have two black wires and 1 white and 1 blue... wich of all is the output singnal wire?..

[imzjustplayin]

@rulas702 When you use the volt meter's probes, you attach one probe on the body of the o2 sensor, then with the other probe try out each wire until you get a signal, it's that easy. The o2 sensor uses the body of the sensor itself as a ground, the other wires on the harness are for the heater element in the o2 sensor. If it's a narrow band o2 sensor, the only one of the wires will be the signal wire and the way to find out is to try it. The video here is with a one wire o2 sensor.

[Ozbassman]

ned flanders

[BessieMorrison]

he mixes the high and low voltages around 3:40 . 

[sipapito]

greaT video Thank You!!keep The good work!

[AmazGraz]

Brilliant! What is the correct lead to connect the positive voltmeter lead to? Mine only has four.

[johnobd]

great vid

[starcruise12345]

Very nice videos. I learned a lot from you guys. Thanks

[studisme]

Absolutely Fantastic Guys. Thanx.

I have 2 pre cat sensors on my Beemer. They cost over a £100 quid each!!

Believe me, I dont want to replace them unless they are knackered. Now I know how to check them myself! Ive got a digital test meter, ive got the lambdas, and ive got half a brain. Why pay a mechanic £80 quid to test em, when you can do it yourself?! Really good stuff guys, well done.

[pfun41]

@studisme new cars stink. they can have 4 of those damn things. lucky my 94 only has one.

[CHAMPSWALL]

great video !

[dashwood123]

I tried this test using a gas stove which did not work as it did not have enough heat. Then I tried it with a propane torch which was hot enough to conduct the test. The meter struggled to reach 0.9 within a minute, in fact it reached 0.9 for about 2 seconds, after that it would only hover around the 0.7 and 0.8 mark. I could not get it to reach 0.9 again.

I suppose that means I need a new O2 sensor.

[4runner666]

this is great. it can be hard to find info on older efi systems.

[DALE97DSM]

Neat.

[thenightwolf80]

I understand its value range and how to test. But P0420. Upstream read 2.9V and Downstream read .31V.. Snap TP and O2 Up read 5.1V and Down remained constant. no air leak from engine throughout exhaust to cat. Yes Cat is old but no leaks. Would you say Cat or O2 Upstream?

[ShunKamiko]

You can actually also test it while it's in the vehicle, with it running after the engine has been warmed up. be careful to not burn yourself, though

[echaru]

Too bad I don't have blow torch around in my house.

[xueyongchen1001]

nice

[doromanekia]

tried this worked out well thanks

[murto30]

Very good tips, well done.

[Ozbassman]

top vid NED FLADERS!!!!!

[aikaha]

Where is this voltage being generated? where is there power source? They are leaving something out.

[mexskal]

well the o2 sensor is a generator of its own signal dc, on modern cars the pcm send voltage to the heater of the o2 to warm it up, to be more efficient also the voltage send returns to the pcm and compares them

[asianguy207]

from the meter...

[MrKhalio]

why there is no any power supply to the sensor

[skitch]

because they use heat to change the resistance and the ECU checks that resistance against spec values and adjusts accordingly. A lean A/F ratio burns hotter than a Rich A/F mixture.

[souseman]

the sensor produces energy from heat

[st2hallock]

this is so cool ... its like the diag classes my grampa would have taken.(LOL) Thank god for obd2 and CAN. I think the funniest part is when he says "some o2 sensors have more than one wire" and "some have a little heater" how long has it been since vehicles weren't equiped with HO2S(heated oxygen sensors)

[rwdplz1]

The great thing about these videos, is they're the same age as my car: 84 Pontiac Fiero. A lof of the videos use the same sensors, etc.

The early fuel injected cars are a LOT easier to work on than the 96+ OBD2 cars.

[st2hallock]

omg how old is this video?