Diagnosing a catalyst efficiency code (P0420 or P0430)

Uh oh, it’s the dreaded P0420 (or P0430)… This Ford Taurus gave me the opportunity to discuss catalytic converter testing, as well as a chance to demonstrate an oxygen storage test. There’s a lot of misinformation in the industry about converter efficiency codes, and I’m hoping to clear up a lot of that with this case study. To be clear, this video is addressing catalyst efficiency codes ONLY, not restricted exhaust problems! Engine Performance Diagnostics chapter 5 pages 24 - 27 Symptoms - check engine light (P0420, P1000, P1270) Fix - replaced the failed catalytic converters Tests shown - understanding the significance of the P1000 code and how to inform your customer - understanding how catalyst temperature is important to catalytic converter diagnostics - using exhaust gas to heat catalysts for testing purposes - checking for other potential faults such as faulty O2’s and exhaust leaks - performing an oxygen storage test using propane enrichment - using a scope to view multiple O2 sensor signals - how O2 signals can look good but still fail a catalyst monitor - detecting a borderline catalytic converter - checking for external sources of catalyst failure, such as misfires and fuel trim issues - understanding the distinction between a plugged catalyst and an inefficient catalyst Tools used - Autel MS905 MaxiSys Mini Diagnostic System with Connector Kit - USA Version https://www.jbtoolsales.com/autel-ms905-maxisys-mini-diagnostic-system-with-vci-and-connector-kit-usa-version/#oid=1014_1 - OTC 7148 Propane Enrichment Kit https://www.jbtoolsales.com/otc-7148-propane-enrichment-kit#oid=1014_1 - PicoScope 4425 4 Channel Standard Diagnostic Kit http://www.aeswave.com/PicoScope-4425-4-Channel-Standard-Diagnostic-Kit-p9276.html Playlist - (Chapters 4 and 5) Fuel Trim and Oxygen Sensor Testing https://www.youtube.com/playlist?list=PLD2809EEC7BAAF989 Related videos - O2 sensor testing (fixed lean) P0174, P0154, P0155 - Mitsubishi https://youtu.be/2VW78LKAQYY - P0133 O2 Slow Response (reversed O2 connectors) - Hyundai https://youtu.be/WrCa9cC9EPg - How to test an oxygen sensor on a Honda (scope vs voltmeter) https://youtu.be/uYMGnvtgi8w - Downstream Fuel Trim (A James Danner video review) https://youtu.be/_DPcvIXFrtw 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.