MAF and Wideband O2 Sensor Testing for a P0172 [Rich Condition]

The car being tested is a 2007 Suzuki SX4 but the methods shown apply to all cars! It is very difficult sometimes to identify proper operation of a wideband O2 sensor and also the calibration of the MAF sensor. In this video we cover both of these tests very thoroughly and are able to fix the car.

00:00 - customer complaint, repair history (rich condition P0172)
02:13 - upstream and downstream oxygen sensor testing
09:00 - fuel trim analysis
09:55 - common causes of rich conditions
10:15 - MAF sensor testing begins
16:30 - MAF sensor inspection and cleaning
20:00 - adding fuel to confirm wideband function
22:20 - Stink Bug Video https://youtu.be/4E--DtUUG_I
25:40 - lab scope tests of the MAF sensor
30:10 - day 2, used MAF sensor comparison
35:15 - why the "unplug it test" can get you in trouble https://youtu.be/1Ea0Sjx_ZXE
36:50 - SD Premium Skewed MAF sensor case study Part 1 https://tinyurl.com/3ccpz2fb Part 2 https://tinyurl.com/32ubrjfd
37:10 - counter fuel trim numbers (is it fixed?)
39:30 - Understanding Short Term and Long Term Fuel Trim (a SD Premium video) https://youtu.be/oRX2V6_a3dc
42:06 - scan data MAF and Calculated Load numbers after repair
43:10 - How to identify and clean a dirty MAF sensor (Subaru) https://youtu.be/QwGICKqWgM4
46:55 - lab scope tests on the used MAF

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For more information on this topic, I have written a “field manual” called Engine Performance Diagnostics which is available at www.scannerdanner.com as an eBook or paper book.
Want even more diagnostic training? Whether you are a DIY trying to fix your own car, someone looking to become an auto technician, or a current auto technician that wants to get more into diagnostics, subscribe to ScannerDanner Premium https://www.scannerdanner.com/join-scannerdanner-premium.html There is a 14 day free trial.
On ScannerDanner Premium I will bring you right into my classroom at Rosedale Technical College. You will find page for page lectures taken right from my book as well as exclusive classroom type case studies. What is so special about these classroom case studies? I pull live problem vehicles directly into my classroom and we troubleshoot them in real time, using and applying the theory and testing procedures we learn during the classroom lectures. There is no better on-line training of how to troubleshoot automotive electrical and electronics systems anywhere!

Disclaimer:
Due to factors beyond the control of ScannerDanner LLC, it cannot guarantee against unauthorized modifications of this information, or improper use of this information. ScannerDanner LLC assumes no liability for property damage or injury incurred as a result of any of the information contained in this video. ScannerDanner LLC recommends safe practices when working with power tools, automotive lifts, lifting tools, jack stands, electrical equipment, blunt instruments, chemicals, lubricants, or any other tools or equipment seen or implied in this video. Due to factors beyond the control of ScannerDanner LLC, no information contained in this video shall create any express or implied warranty or guarantee of any particular result. Any injury, damage or loss that may result from improper use of these tools, equipment, or the information contained in this video is the sole responsibility of the user and not ScannerDanner LLC.

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