Secondary Air Injection and Catalyst errors
10-28-2009, 05:56 PM
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Secondary Air Injection and Catalyst errors
I'm getting the following messages intermittently. I reset the the codes and the error comes back.
P0421 - Warm Up Catalyst; Bank 1: Efficiency Below Threshold Intermittent
P1423 - Secondary Air Injection System; Bank 1: Insufficient Flow
P1411 - Secondary Air Injection System; Bank 2: Insufficient Flow
I replaced the air pump relay incase that was the issue but the MIL light came back on after about 500 miles. I find it odd that both bank 1 and 2 have the error. Is the pump going bad?
What's the warm up catalyst error all about? Do I have a cat going bad?
P0421 - Warm Up Catalyst; Bank 1: Efficiency Below Threshold Intermittent
P1423 - Secondary Air Injection System; Bank 1: Insufficient Flow
P1411 - Secondary Air Injection System; Bank 2: Insufficient Flow
I replaced the air pump relay incase that was the issue but the MIL light came back on after about 500 miles. I find it odd that both bank 1 and 2 have the error. Is the pump going bad?
What's the warm up catalyst error all about? Do I have a cat going bad?
10-29-2009, 05:57 AM
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Are you using VCDS to scan and diagnose this car? If so please post an auto scan. You can run output tests on the air pump and solenoids for example with VCDS.
http://wiki.ross-tech.com/index.php/17819/P1411/005137
http://wiki.ross-tech.com/index.php/17831/P1423/005155
If you include some vehicle details such as the auto scan and year, model, etc. someone may be able to see if there is an update related to this fault.
http://wiki.ross-tech.com/index.php/16805/P0421/001057
http://wiki.ross-tech.com/index.php/17819/P1411/005137
http://wiki.ross-tech.com/index.php/17831/P1423/005155
If you include some vehicle details such as the auto scan and year, model, etc. someone may be able to see if there is an update related to this fault.
http://wiki.ross-tech.com/index.php/16805/P0421/001057
10-29-2009, 07:27 AM
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2000 A6 2.7T. I'm using the shareware version of VAG COM with a third party cable to read the codes. I had to got the Wiki page to decode the numbers on some of the codes.
10-29-2009, 09:21 AM
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Well you are going to need to buy a Software License in order to do much more. You cannot run the basic settings, auto scan , etc...
http://www.ross-tech.com/Merchant2/m...ry_Code=VAGCOM
Since the software seems to recognize the 3rd party interface, it should be safe to purchase the license. You may want to verify communication to all the installed control modules. Possibly avoid the radio:
http://www.ross-tech.com/vag-com/aud...es.html#Radios
http://www.ross-tech.com/Merchant2/m...ry_Code=VAGCOM
Since the software seems to recognize the 3rd party interface, it should be safe to purchase the license. You may want to verify communication to all the installed control modules. Possibly avoid the radio:
http://www.ross-tech.com/vag-com/aud...es.html#Radios
01-24-2012, 07:44 AM
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I've got an '06 A8 with the same 'insufficient flow' issue on both banks. Here are my thoughts: Since both banks are problematic and throwing codes, either the solenoid that controls the combination valves is not working correctly or the combi valves are gummed up with carbon not allowing enough airflow, or the pump is weak. I don't think I have a leak in the piping since I can't blow through the pipe at the air pump when the car is off (i.e. valves are closed).
I am able to run the air pump using the VAG-COM and the pump whirs and sounds great...could be the pump but I'm not starting there.
My next step is to apply vacuum using a vacuum gun at the line to the solenoid that opens the valves and then try blowing in the pipe at the air pump. If it's unrestricted, I'll replace the solenoid (about $70) and see what happens. If it's restricted, I'll then pull one of the combi valves and look for gunk...if it's gunked up, I'll clean both valves as best I can and sea foam the vacuum system...if that doesn't get rid of the MIL, I'll then replace both combi valves at ~$170/ea.
If the combi valves are not gunked up and open/close with vacuum, it looks like the air pump is weak and I'll probably end up replacing that at ~$320.
If anyone has a better way of diagnosing, please, please share. I know the VAG-COM can measure airflow but I don't know how to do that nor what it should be.
I am able to run the air pump using the VAG-COM and the pump whirs and sounds great...could be the pump but I'm not starting there.
My next step is to apply vacuum using a vacuum gun at the line to the solenoid that opens the valves and then try blowing in the pipe at the air pump. If it's unrestricted, I'll replace the solenoid (about $70) and see what happens. If it's restricted, I'll then pull one of the combi valves and look for gunk...if it's gunked up, I'll clean both valves as best I can and sea foam the vacuum system...if that doesn't get rid of the MIL, I'll then replace both combi valves at ~$170/ea.
If the combi valves are not gunked up and open/close with vacuum, it looks like the air pump is weak and I'll probably end up replacing that at ~$320.
If anyone has a better way of diagnosing, please, please share. I know the VAG-COM can measure airflow but I don't know how to do that nor what it should be.
07-03-2012, 09:01 AM
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I've got an '06 A8 with the same 'insufficient flow' issue on both banks. Here are my thoughts: Since both banks are problematic and throwing codes, either the solenoid that controls the combination valves is not working correctly or the combi valves are gummed up with carbon not allowing enough airflow, or the pump is weak. I don't think I have a leak in the piping since I can't blow through the pipe at the air pump when the car is off (i.e. valves are closed).
I am able to run the air pump using the VAG-COM and the pump whirs and sounds great...could be the pump but I'm not starting there.
My next step is to apply vacuum using a vacuum gun at the line to the solenoid that opens the valves and then try blowing in the pipe at the air pump. If it's unrestricted, I'll replace the solenoid (about $70) and see what happens. If it's restricted, I'll then pull one of the combi valves and look for gunk...if it's gunked up, I'll clean both valves as best I can and sea foam the vacuum system...if that doesn't get rid of the MIL, I'll then replace both combi valves at ~$170/ea.
If the combi valves are not gunked up and open/close with vacuum, it looks like the air pump is weak and I'll probably end up replacing that at ~$320.
If anyone has a better way of diagnosing, please, please share. I know the VAG-COM can measure airflow but I don't know how to do that nor what it should be.
I am able to run the air pump using the VAG-COM and the pump whirs and sounds great...could be the pump but I'm not starting there.
My next step is to apply vacuum using a vacuum gun at the line to the solenoid that opens the valves and then try blowing in the pipe at the air pump. If it's unrestricted, I'll replace the solenoid (about $70) and see what happens. If it's restricted, I'll then pull one of the combi valves and look for gunk...if it's gunked up, I'll clean both valves as best I can and sea foam the vacuum system...if that doesn't get rid of the MIL, I'll then replace both combi valves at ~$170/ea.
If the combi valves are not gunked up and open/close with vacuum, it looks like the air pump is weak and I'll probably end up replacing that at ~$320.
If anyone has a better way of diagnosing, please, please share. I know the VAG-COM can measure airflow but I don't know how to do that nor what it should be.
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