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Quick question! Do you think that a faulty o2 sensor can cause a misfiring code?
Is a lot easier to change the sensor the going through all that
How is it getting voltage when it's not plugged into power from the harness? I understand a resistance change, but I don't see how it is creating voltage not connected to a power source.
0.05 = 1/20th of 1 Volt. To be fair, you're the car guy, and I'm just an electronics guy dealing with a shitty low-RPM idle/hesitation during acceleration.
Awesome video! But how did you get and power to fluctuate while checking the sensor wires and it was unplugged?????? That part confused me lol. Im gonna try this procedure on mine please explain
If you have a scan tool that shows live data, you can see this also, without going under the vehicle.
What if you had the new sensor installed but check engine still comes on. Equally important code read sensors lower one and a new one was installed?
Should I still get the .1-1v signal from the o2 if the cat was clogged up
wait so the only difference between the supposed bad o2 and the new o2 is just 0.03v difference? the old one you tested was at 0.05 and the new one was 0.08, that's a giveaway for a bad o2?
I bought replacement sensor and put it in but getting same error code. So I did your test on the original sensor it has a 1.5 ohms and if I switched the wire its was -1.5 ohms. The new part read 4.5 ohms so my question is, is this new part bad too?
This is an excellent demonstration of how to properly test the sensors works on almost every vehicle. I needed it because I am having troubles with my Toyota Camry and all indications from the OBDII lead me to the downstream sensor which is an unpleasant thing to reach. Looks like I can now at least test it before dealing with an unpleasantly hot exhaust system that needs to be dropped in order to remove said sensor. Thank you for a nice and concise video.
HI. Are U still around. You have to talk to me as if I am a 2 yr old.What does PCM mean?
do you do the same diagnostics if it's a Air Fuel Ratio Sensor?
Great information but what were the symptoms when driving? Thanks and God Bless.
Don't buy O2 sensors, proceeds to buy a new O2 sensor 😂
Thank you for the video 😊
Simple, clear, and to the point. Thank you.
Can the O2 sensors go bad without the engine light on?
Can the O2 sensors go bad without the engine light on?
The upstream O2 sensor was bad, but I think the downstream O2 sensor was good since it stayed flat with its voltage, which indicates the CAT 🐈 is doing its job.
Any thoughts?
2005 Jeep Wrangler 4.0 all 4 sensors testing low on heater code P0031 – P0037-p0051-p0057 I replaced all with NGK and still lit on. I checked all the wires, disconnected the PCM, and continuity was all good, Pin 1-3-4 were good from the sensor to PCM plug and pin 2 to ground, my question is does pin 1 heater wire have 12v because I'm getting nothing as I understand on a cold start the PCM will circle a 12V + or 12V Negative signal to the heater. The circle will decrease to off as the sensor heats up.
Thanks
Excellent young man. You and the sometimes annoying young man at Shrodinger are Awesome :))))
I tinker and barely know enough which gets me in trouble.
I picked up a 2004 Durango 3.7 with 115 thousand original miles is a misfire pain in the butt.
Had a compression test and leak down test which indicated very good.
Changed original plugs and put new coil packs in.
Ran for 30 miles and started misfiring. Once it started with cal 3 then 4, switching coil pack around would get it back running for another 25 or so miles.
reader always has indicated low voltage bank 2 rear 02.
Also reads IAT sensor has issues.
My resistance between white o2 side wires is 4.4. You said it should be 5-7.
It makes sense this could be an issue.
Best; Tom
Great video, just to add it always better to back probe instead of possibly spreading the contacts inside the connector causing a bad or faulty result
how times have changed. Nowadays, a cheap code scanner with live stream data can give you a glimpse before busting out the harbor freight voltmeter and going feral.
You tested if voltage is reaching os heater but ur engine was off and u didn't mention this. Does this mean sensor is powered all the time ? This doesn't add up.
✅
Hi JeepSolid, the resistance of my upstream O2 sensor reads at 7.8ohms. On the Wrangler TJ it should be between 5-7ohms.
Is it a problem that the resistance is higher that 7 ohms? Does that mean there is an issue with the heated of the sensor?
This is great but the old o2 sensor just will not come off. I tried everything, engine warmed up to operating temp, o2 sensor socket clamped with a hose clamp, breaker bar. It still just strips the threads. How the hell is a DIYer without a lift, blow torch and dremel supposed to remove the sensor? Mechanic wants $400 for a 15 min job. That's $1600 per! Why do they charge so much?
Can a large evap leak be from bad upper and lower o2s? And I was also wondering if someone could answer me about the map sensor, is that part of evap as well ? Codes are saying large evap leak , and now saying 2 o2s bad. I'm going to try ro figure this out
I check my oxygen sensors voltage output with an OBD tool , live streaming.
The multimeter needs a new battery
Excellent way to describe the process and why it's not working.
So you don't unplug the car battery when doing this testing.. 👍 thanx for sharing
Title: "Don't buy oxygen sensors" Video: Buys oxygen sensors 😀
My bad but I definitely got "Fix It Felix" vibes.
Thanks this was most informative and easy to follow visually. I’m going to try it now
For a 1994 bmw 318i which order are the camshaft crankshaft bank 1 and bank 2 knock sensors connected into the wiring harness
Great video. I do not understand how the o2 sensor provides a voltage if it's not plugged into a power source when you were testing them with the DVM. Can you please explain it to me. Thanks.