help me with codes: p1411,p1423

[-C5-]

i got my codes down from 6 to 2.
the codes left are:
p1411 and p1423

they are for bank 1 and bank 2 SAiP.

so far ive checked my saip, its perfect.
then the plastic hoses , perfect.
then vacuum hoses - all brand new
just got new o2 sensors.

now all i have left is the N112 Valves and possibly egr valves.

since i am getting codes for both bank 1 and 2 secondary air , is it possible the problem is the N112 solenoid valves?
what are the odds of both going out at the same time?
i need help to pinpoint the problem , so if anyone has experienced this and has a solution.
or if anyone knows what my problem could be,and what could be causing both banks to show codes. please let me know.
THANKS EVERYONE!

[-C5-]

bump

[2.7taudi]

id say since both banks are throwing a code it s bad secondary air pump. you said all the vacuum hoses are in good condition and properly installed so thats ruled out.

final thing is to check the secondary air pump's fuse. located in the with the ecu next to the brake fluid. if you put a new fuse and it blows the pump is bad.

[-C5-]

id say since both banks are throwing a code it s bad secondary air pump. you said all the vacuum hoses are in good condition and properly installed so thats ruled out.

final thing is to check the secondary air pump's fuse. located in the with the ecu next to the brake fluid. if you put a new fuse and it blows the pump is bad.

but i got another SAIP and hooked it up, and cleared the codes. and it came back the same. nothing changed.
i have 3 weeks left till i have to smog it. this is killin me.

[2.7taudi]

idk if your car is the same but, mine does this: after i start and warm the car i clear the code and the code does not come back until the SAIP starts on a cold start. try that. that should help you pass the inspection but the MIL will come back after 2~3 cold ignitions.

have you checked the fuse? if you say u have replaced the pump (im guessing your old one died) once it dies the fuse blows along with it. so until you replace that fuse your pump will not start.

[-C5-]

idk if your car is the same but, mine does this: after i start and warm the car i clear the code and the code does not come back until the SAIP starts on a cold start. try that. that should help you pass the inspection but the MIL will come back after 2~3 cold ignitions.

have you checked the fuse? if you say u have replaced the pump (im guessing your old one died) once it dies the fuse blows along with it. so until you replace that fuse your pump will not start.

the pump never died. i replaced it because i got a code for it and the mechanic i took it to said its the SAIP.
so i replaced it. and it turns out its not the SAIP. and mine was fine all along.

so then i replaced all vacuum hoses because someone suggested that.
then i replaced the bank 1 and 2 o2 sensors.
and inspected the hell out of all plastic hoses.

i checked the fuse with a multimeter and its fine.

thats why i am stuck with the last 2 options witch seem to be quite expensive. so i want to pinpoint the issue before i throw money on guesses.

n112 valves are about $130/ea and the combi valves are even more.

im sure this has happened to someone before. it seems like a common enough problem with these cars.

[2.7taudi]

ive read a thread over in audiworld about a guy who flashed his ecu to remove the sai from the ecu's memory. that would eliminate the MIL for good. and removing it would do no harm to any other components.

[-C5-]

this sounds interesting. if i eliminate the SAIP from the ECU, will it allow the car to find the actual problem?
I.E since theres no saip the next sensor over would have to throw a CEL, helping me pinpoint the issue?

[Kamil`]

if only I could find someone to flash my ECU...

[Audi_Tech]

Since it's throwing the fault for both banks then it's something common to them both: 1) The SAI pump 2) The Sec Air Solenoid Valve N112 or wiring to it 3) The vacuum supply line to the N112.

1) If you have Vagcom you can perform output test (I believe that's what it's called) to check the wiring to the SAI pump and pump itself.

2) Output test will also perform the same test to the N112 (cycles power on/off - valve should click and airflow (*vacuum from the engine) should flow accordingly

3) Obvious vacuum test of the line

If this is a 2.7L then check your turbo recirc valves for a vacuum leak-if they don't hold vacuum then they're bad. If they leak then the N112 won't get enough engine vacuum to open the combi valves completely and Sec Air faults will occur.