I'm showing the difference in resistance between two air/fuel sensors that can fit the same vehicle. One will set a check engine light, but the other will not. Same method applies to regular oxygen sensors.
Пікірлер: 37
@RomanAutomotive10 жыл бұрын
When I was saying about the sensor being open, and there being not resistance, that is incorrect. If heater circuit is open, the meter will read out of limits, not 0 resistance.
@frankvasquez13874 жыл бұрын
Roman, thanks for the good information! Something to really watch out for! Good Job!
@seekers284 жыл бұрын
My car is having a lean issue,both upstream sensor bank 1 and 2 is new but i still got a code 25,both bank too lean with scanner,and its reading 0.00mV at live data stream..any idea whats happening?seems like the ecu is ignoring the new o2 sensor
@mckoylach16223 жыл бұрын
Does this procedure applied to the 2010 pilot sensor also? I have two codes,P0135 and P0155 . Thanks
@greddyt059 жыл бұрын
Quick question for you. Do you know if it's possible too install an ohm resistor into the harness for the sensor by the catalytic converter so that you can leave the sensor unplugged and not show a code? As a way of tricking the computer.
@RomanAutomotive9 жыл бұрын
I would think that is a possibility. The downstream sensor usually should stay sturdy
@rodzodrizzle13866 жыл бұрын
If you put a resistor on what about the fuel trims
@shawnthaxton91825 жыл бұрын
Just tested my 2 black wires on my 07 camry have nothing reading(OL) sensor looks to been replaced at one time. looks newer thinking it has failed have p0031
@scooter123688 жыл бұрын
do all cars have fuses for 02 sensor. got a 0053 code so i unplugged upstream sensor and car chevy aveo 2011 and it ran well. concluding bad o2 sensor. i did get 12 volts through the harness bought another sensor, no harness with it. i wired the new one. same problem, car runs well after warm up engine dies. i unplug new sensor and it starts running well again. can you give me a direction to follow. i have volt meter and test light only. fuse box inside doesn't indicate any fuse for 02 sensor. haynes, chilton has no manual for that car. i did change plugs 4 weeks earlier, no codes at time and car running well. just did a maintenance thing. thanks
@billvillanueva67296 жыл бұрын
i tried to test the resistance of my downstream 02 sensor and i got about 14ohms, what is the normal resistance of downstream o2 sensor? I have a p0420 code always showing everytime at an idle.
@adamrozman5 жыл бұрын
Hi! Did you figure out if it was the o2 sensor?
@adanarceo46363 жыл бұрын
So the normal homs for pretty much every o2 sensor should be between 2.5 to 4.0 homs. Thanks in advance sir. 👍
@charlesdavis43964 жыл бұрын
Your using a Harbor freight $3.00 multimeter. Is using s Fluke meter the same??
@roltyd22 Жыл бұрын
Is 1.4 considered bad?
@laprepper6 жыл бұрын
Having this same issue. The manufacturer said that some times different generation of sensors cause issues with the ECU?
@laprepper6 жыл бұрын
I'm presently on the 3rd sensor on B2S1 and the second sensor on B1S1, both upstream (my car only has 3). None of them are Denso, all of them are Kwiksen (except the lower rear, or 3rd one)
@thegfxmech54757 жыл бұрын
The weirdest thing is going on with my 09 Tacoma. P0031 says it's sensor 1 bank 1 which is the upstream sensor. However when doing a resistance check on the before the cat sensor I get a 2.4ish ohms(3.5 limit) I checked the after cat sensor just out of curiosity and that is way off with 14.5ohms. Why would the code scan give me the wrong sensor??
@snipsey26 жыл бұрын
Jo G Hey did you ever get this figured out? Running into the same problem with my ‘05 Taco. I’m getting P0430 code which is Bank 2, it just doesn’t say which sensor. Testing the before cat sensor I get 2 ohms, and the after cat sensor reads at 13-14ohms. I was thinking my before cat sensor was bad. Was was the issue with yours?
@paulmonk78204 жыл бұрын
@@snipsey2 I think there should be three sensors, two upstream (bank 1 and bank 2), and 1 downstream. The resistance readings you got seem to be OK for b1s1(air-fuel ratio) and b1s2(oxygen). The sensor for bank 2 is also AFR, and is located in the exhaust between the other two. Also, the problem could be with the wiring for the heater circuit, or a blown fuse. Not sure if both AFR sensors run off the same fuse.
@howtodoitdude16625 жыл бұрын
I believe you need to isolate the sensor from the car. You tested two sensors in two different locations.
@AutumnsAdventure156 жыл бұрын
Harbor freight free meter for the win
@padams84855 жыл бұрын
Jerry Smith, Oh yeah Harbor Freight, nice. My Earthquake XT 1/2 inch impact works great too. . Never had a bolt it couldn't break lose with ease.
@danditiello48462 жыл бұрын
ty
@gabrielchukwuka14937 жыл бұрын
pls what should be the resistance on a 2000 Camry air fuel ratio sensor?
@leonvetti67245 жыл бұрын
1. 5 to 1.8 not more than 2. if your AF shows 00 that means no resistance exactly like any wire. And if the meter reads more than 2 Ohns, it is Open, the current is not passing and you need to change the sensor, but before that check the integrity of the harness which is connected to the ECM.
@certaindeed8 жыл бұрын
That;'s why it's good to use the factory OEM manufacturer parts, unless you are very very very familiar with different replacement specs etc. In order to test this correctly you would have to power them up as well to temperature and measure the current and use R=V/I to determine the true operating characteristics, as those can be a couple of ohms different between brands. Otherwise you can spend way more money in labor messing around with this stuff. On your own is fine, on the customer clock never.
@laprepper6 жыл бұрын
you mean "back probe"?
@MrYosmitty8 жыл бұрын
a genius like you using a harbor freight multimeter. that shows mechanics don't make enough money. haha
@certaindeed8 жыл бұрын
+terminal velocity He's good, though.
@seekers284 жыл бұрын
Fuse? Heater circuit have fuse?
@alexwolf80194 жыл бұрын
Yes, if you look in your manual you should see the fuse location. Its normally in the engine compartment fuse block.
@mr.iforgot30622 жыл бұрын
I urinated on the sensor than hit it with a ball peen hammer. It didn't fix the sensor at all. I decided to cut the wires and solder 1/2" copper tubing to make it perform better but that didn't work either. Must be a faulty unit.