Wide Band Air Fuel Ratio Sensor Testing 

Mike, I like that you look at known good! Especially on these new cars. I was also surprised to see the opposite MAF frequency pattern on the Frontier. This is such great information. Thanks for taking the time to capture and share!

Some really great thoughts you have on the usefulness of this test, please keep thinking out loud! Boy would I love to have one of those micro clamps, they are wildly expensive.

Mate, I love your videos and I have learned a lot from you. As we all learn from eash other, though, I have ro point out that the Wideband Oxygen sensor readings are the opposite to what you stated in the video. Positive current (above the zero line) menas LEAN. Negative current means RICH. When the engine reved well and you pulled your leg off the accelerator pedal - the moment you call "injectors cut" actually causes the mixture to go RICH (not Lean). The injectors spray a predefined, fixed amount of fuel in this condition (fuel ECU does not look at the O2 readings then). The reason is to avoid mixture getting lean and causing "pops" on deacceleration.😊 As the throttle is fully closed at this moment, there is less air than normal and mixture is Rich. Hence the O2 sensor reading goes sharply negative (Rich) and stays there until engine load increases again and the Idle Valve opens to increase engine speed (to make it Idle). At the other moment, when you sharply pressed the acceliratior pedal, lots of Air entered the engine and the O2 sensor reading went up (Lean). The Fuel ECU compensated a moment later and the O2 reading went back to balanced. Hope that helps. Thank you so much for the effort in putting these videos together and sharing your knowledge.

This is great & I will be following your testing & results with interest.

Awesome video. Good for you to grab your hands on the K110 amp probe. It is an awesome piece of engineering. I live in Europe and already have a pico 4423, but I will upgrade to a 4425 from Autonerdz. Thanks for sharing your thoughts on this topics, helps a lot and encourage us to have an open mind and keep on learning

awesome video i like that amp clamp

Very interesting video. Great they let you experiment on some new cars for test subjects. Was particularly impressed with how tps and maf were practically linked together. 2 questions. You mentioned orienting clamp to show amp capture in the way you did. Was that just easier for you to think through it? I was thinking that under rich conditions an A/F sensor would go into negitive ma and vise/versa for lean. Maybe I was wrong?

Really good info here! Wow! Now you've inspired me to try this on my cars. Question, would a standard low amp clamp work or is that low amp clamp you mentioned something special? I have the ES #695 20/80 amp clamp. Also, I really like the way you think. Testing things now to get a baseline on new vehicles so that you have something to reference down the road when those vehicles have problems. That sounds like genius level stuff to me. God blessed you with a great mind. Thanks for what you share with us.

I wonder if one could do a rc test using the vehicles map or turbo boost sensor🤔, something i am going to have to play with. Thank you for the effort and inspiration.

Brilliant video Thanks for sharing it 👍 QUICK-WITTED Carter's Diagnostics From Nick Ayivor from London England UK 🇬🇧 ⏰️ 06:35am Good Morning 🙏 🌄

Please make one video for k 110 currant clamp how to custom probe in pico and wr we found this clamp

I guess you are not a high end tech school teacher by choice 😊

Excellent video thanks for sharing.

Can u send link to purchase the k110 amp probe