Failed SAI Pump (P1411&P1423) Causing P0423 Cat Code?
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Audiworld Junior Member
Joined: Mar 2012
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Failed SAI Pump (P1411&P1423) Causing P0423 Cat Code?
A month back I got the SAI Incorrect flow on both banks codes. SAI pump sounds like a dentist drill mated with a jet engine so I know its done. I'll deal with the pump later when its emissions time.
BUT
Two weeks ago, I started to get the P0423 Cat code as well. I don't think my Cat is dead. Pre Cat o2's were swapped out 2K miles so rule that out. If it's because of the post cat o2's then the Cat must be dead but I have no code for Lambda sensors.
So questions are...
1) Is the Cat code being thrown due to the SAI Pump not heating the Cats up on cold starts?
2) Noticed when I started car with the front jacked up that some water (from combustion) was dripping from the double clamp between catalytic pipes and the center muffler. Leak possibly throwing code?
3) Or is it just the Cat in bank 1 is bad?
Before I began trouble shooting I figured I'd reach out to the Forums see if someone else ran into this and can save me the PITA of poking around.
BUT
Two weeks ago, I started to get the P0423 Cat code as well. I don't think my Cat is dead. Pre Cat o2's were swapped out 2K miles so rule that out. If it's because of the post cat o2's then the Cat must be dead but I have no code for Lambda sensors.
So questions are...
1) Is the Cat code being thrown due to the SAI Pump not heating the Cats up on cold starts?
2) Noticed when I started car with the front jacked up that some water (from combustion) was dripping from the double clamp between catalytic pipes and the center muffler. Leak possibly throwing code?
3) Or is it just the Cat in bank 1 is bad?
Before I began trouble shooting I figured I'd reach out to the Forums see if someone else ran into this and can save me the PITA of poking around.
Audiworld Junior Member
Joined: Jan 2012
Posts: 55
Likes: 0
A month back I got the SAI Incorrect flow on both banks codes. SAI pump sounds like a dentist drill mated with a jet engine so I know its done. I'll deal with the pump later when its emissions time.
BUT
Two weeks ago, I started to get the P0423 Cat code as well. I don't think my Cat is dead. Pre Cat o2's were swapped out 2K miles so rule that out. If it's because of the post cat o2's then the Cat must be dead but I have no code for Lambda sensors.
So questions are...
1) Is the Cat code being thrown due to the SAI Pump not heating the Cats up on cold starts?
2) Noticed when I started car with the front jacked up that some water (from combustion) was dripping from the double clamp between catalytic pipes and the center muffler. Leak possibly throwing code?
3) Or is it just the Cat in bank 1 is bad?
Before I began trouble shooting I figured I'd reach out to the Forums see if someone else ran into this and can save me the PITA of poking around.
BUT
Two weeks ago, I started to get the P0423 Cat code as well. I don't think my Cat is dead. Pre Cat o2's were swapped out 2K miles so rule that out. If it's because of the post cat o2's then the Cat must be dead but I have no code for Lambda sensors.
So questions are...
1) Is the Cat code being thrown due to the SAI Pump not heating the Cats up on cold starts?
2) Noticed when I started car with the front jacked up that some water (from combustion) was dripping from the double clamp between catalytic pipes and the center muffler. Leak possibly throwing code?
3) Or is it just the Cat in bank 1 is bad?
Before I began trouble shooting I figured I'd reach out to the Forums see if someone else ran into this and can save me the PITA of poking around.
IMO the secondary air inj. cannot be the cause of P0420-p0424 cat codes. some people get those pumps coded out but leave the cat codes intact and dont have issues with it.
What i would do is drive the car hard and for a long drive. Maybe during an oil change, the oil was slightly overfilled. blocking the cats pores. A long continuous drive MAY help it.
other wise getting thr cats coded out will be cheaper than actually replacing the cats.
AudiWorld Newcomer
Joined: Oct 2012
Posts: 7
Likes: 0
IMO the secondary air inj. cannot be the cause of P0420-p0424 cat codes. some people get those pumps coded out but leave the cat codes intact and dont have issues with it.
What i would do is drive the car hard and for a long drive. Maybe during an oil change, the oil was slightly overfilled. blocking the cats pores. A long continuous drive MAY help it.
other wise getting thr cats coded out will be cheaper than actually replacing the cats.
What i would do is drive the car hard and for a long drive. Maybe during an oil change, the oil was slightly overfilled. blocking the cats pores. A long continuous drive MAY help it.
other wise getting thr cats coded out will be cheaper than actually replacing the cats.
Thread Starter
Audiworld Junior Member
Joined: Mar 2012
Posts: 15
Likes: 0
Code went away. Looking for a local means of flashing SAI system from my ECU as I do not wish to spend $400 on a new air pump.
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