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Note: Only a high pressure service valve is used for A/C system servicing. A low pressure service valve is not installed. Perform all A/C system service (ie. discharging, evacuating and charging) through the high pressure service valve only.
P1411 - secondary air injection system flow too low Bank 2.
P1423 - secondary air injection system flow too low Bank 1.
Check vacuum hoses to combi valves ,
most common split air injection pump which is riveted with aluminum rivets,ck rivets if they coming out ,pump doesn't build enough pressure.
In this case take pump out and put bolts instead of rivets all around pump case.Repl. all rivets not only broken one.Bolts sold at HomeDepot , just find a needed size.
On that year a4 and a6 there is no low side charging port. (sucks) The way you charge those systems is by evacuating all of the refrigerant, then with the vehicle off, add the correct amount of refrigerant to the high side port (turning the compressor over by hand occasionally)
There is not low pressure, best is to discharge the system find an aluminum welder and install a low pressure valve, otherwise you have to take the car to the dealer and pay 150 just to fill, and if they find a leak the bill goes up.
HI,AT WHAT SPEED DID THIS HAPPEN,IF AT IDLE OR VERY LOW SPEED,HAVE A NEW BELT FITTED IF IT RUNS NORMALLY YOU ARE LUCKY,IF IT RUN ROUGH WITH BAD MISFIRE OR NOT STARTING AT ALL THE VALVES ARE BENT,PLEASE LET ME KNOW,ANDY.