P0420 P0430 Catalyst Efficiency Below Threshold - Testing & Verification
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Date: 2020-08-05
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Comments and reviews: 9
John
Great video as usual. Quick rundown of the OSC test. Get the cats nice and hot. Let the engine idle and slowly add propane until short term fuel trim hits -20, not causing any misfires or stalling. Take the propane away quickly while watching you O2 sensors. With a good catalytic converter, your downstream O2 sensors response will be delayed more than two seconds behind the upstream sensors because the cats are storing the oxygen from the sudden lean condition. Defective catalytic converters won't store O2 and the downstream O2 sensor jump up within two seconds of the upstream. This test works with af ratio sensors also.
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Great video as usual. Quick rundown of the OSC test. Get the cats nice and hot. Let the engine idle and slowly add propane until short term fuel trim hits -20, not causing any misfires or stalling. Take the propane away quickly while watching you O2 sensors. With a good catalytic converter, your downstream O2 sensors response will be delayed more than two seconds behind the upstream sensors because the cats are storing the oxygen from the sudden lean condition. Defective catalytic converters won't store O2 and the downstream O2 sensor jump up within two seconds of the upstream. This test works with af ratio sensors also.
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Kingy
Hey, don't dis on the Legendary Dodge HEMI! Remember back in 1969 when those Dodge HEMI'S were literally doing full lap laps around the Ford & Chebby's? Yeah, I remember it too! Hey, do you remember when they set nearly every drag racing record in US history? I remember that too! Never talk shit about a Mopar, history has a memory! Oh, and didn't you say you broke down and bought a Jeep, thought I heard that? Maybe your wife has better taste than you. lol, she's probably even a secret Richard Petty fan, she just don't wanna break your heart! ;)
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Hey, don't dis on the Legendary Dodge HEMI! Remember back in 1969 when those Dodge HEMI'S were literally doing full lap laps around the Ford & Chebby's? Yeah, I remember it too! Hey, do you remember when they set nearly every drag racing record in US history? I remember that too! Never talk shit about a Mopar, history has a memory! Oh, and didn't you say you broke down and bought a Jeep, thought I heard that? Maybe your wife has better taste than you. lol, she's probably even a secret Richard Petty fan, she just don't wanna break your heart! ;)
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justaworkin
I really appreciate you making these videos. I have watched a ton of them just for general learning and this one is specific to what my truck is doing. It's nice too see how you go out of your way to fully verify the problem instead of just throwing some parts at it and hoping it works. You also show us and explain the diagnostic process so that we can know what we are looking at. The comedy side is a huge bonus. Thank you sir. Now I can go dig into my truck
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I really appreciate you making these videos. I have watched a ton of them just for general learning and this one is specific to what my truck is doing. It's nice too see how you go out of your way to fully verify the problem instead of just throwing some parts at it and hoping it works. You also show us and explain the diagnostic process so that we can know what we are looking at. The comedy side is a huge bonus. Thank you sir. Now I can go dig into my truck
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Stanley
Dejavu for me, customer has a 2006 Taurus with the same symptoms and codes from your Shooting The breeze video, there was also PO420 as well, graphed the O2 on the Autel and it looks just like what you have on this Commander. The Taurus has California Emissions so you can imagine her reaction when I told her she has to spend another 400. 00 for the Cat and all 4 struts are bad. Inspection is due next month.
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Dejavu for me, customer has a 2006 Taurus with the same symptoms and codes from your Shooting The breeze video, there was also PO420 as well, graphed the O2 on the Autel and it looks just like what you have on this Commander. The Taurus has California Emissions so you can imagine her reaction when I told her she has to spend another 400. 00 for the Cat and all 4 struts are bad. Inspection is due next month.
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joesnowmobiles
Love your stuff! Question on a 2012 Acadia, had a friend replace his bank 1 cat and 02 sensors but still getting code P0420. I'm thinking maybe timing is off, is there a way to check that? No other codes showing. FYI I dont think the proper diagnostic tests were done before this work was completed.
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Love your stuff! Question on a 2012 Acadia, had a friend replace his bank 1 cat and 02 sensors but still getting code P0420. I'm thinking maybe timing is off, is there a way to check that? No other codes showing. FYI I dont think the proper diagnostic tests were done before this work was completed.
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TERRY
Been doing it myself all my life learning the hard and expensive way.
Then came SMA / Scanner Danner/ Pine hollow.
I're seen the light. money Light that is.
Eric, I owe you brother. I never watch one of your videos and not learn something.
This one is a Biggy.
Thanks.
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Been doing it myself all my life learning the hard and expensive way.
Then came SMA / Scanner Danner/ Pine hollow.
I're seen the light. money Light that is.
Eric, I owe you brother. I never watch one of your videos and not learn something.
This one is a Biggy.
Thanks.
reply
Ken
Makes me relive my old Dealership days over. Very good explanation of the diagnosis and follow up. I enjoy all of your videos. I will eventually make my way up to visit your shop, just to say Hey and spend some money with you. Keep up the good work.
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Makes me relive my old Dealership days over. Very good explanation of the diagnosis and follow up. I enjoy all of your videos. I will eventually make my way up to visit your shop, just to say Hey and spend some money with you. Keep up the good work.
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Wildturkey10121
I don't know about anyone else but I miss the frequent longer videos, I understand this is a busy time of year and it is hard for you to make the longer vids, I can't wait for their return!
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I don't know about anyone else but I miss the frequent longer videos, I understand this is a busy time of year and it is hard for you to make the longer vids, I can't wait for their return!
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Rick
I learned a lesson along time ago. Never never loan out tools whether its a socket wrench, or a scan tool. Never loan out tools. Always get burned when doing so. Its just not worth it.
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I learned a lesson along time ago. Never never loan out tools whether its a socket wrench, or a scan tool. Never loan out tools. Always get burned when doing so. Its just not worth it.
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