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You can go to a garage and reset the codes using a code reader. You can also do it by disconnecting the battery for 2 hours. Make sure the key is in the ignition when you reconnect. Leave the vehicle 15 minutes after reconnecting to allow resets to ECM and anti-theft system to finish. Make sure you know your radio code.
Hi David, Sound as if you have a problem with the dump valve opening too soon. Both turbo's should operate together not in stages. If you have twin turbos there will be one for each bank. The dump valve is a flap which opens when the compression becomes too high. Its operated by vacuum via a diaphragm with a lever operation. You'll be wise to have both units attended to and set so they operate as they should. Regards Johngee10
A dump valve replaces the recirc valve. Did you see the reply to your prior post on this topic that I put up the other day? You can do it but it'll cost you your catalytic converter and O2 sensors - that has been proven out many times in the past. If you don't care about that and don't mind spending $1200-1500 every year or 18 months to replace those parts, then go to www.audiworld.com or www.audidiy.com and look in the tech areas - there are step by step procedures there that walk you through recirc valve replacment. They'll show you how to fit an aftermarket recirc valve, but you can follow that procedure to do a BOV as well.
Seriously though, as I said before, some cars are fine with BOVs but Audis are not. You're going to cost yourself a LOT of money just for the sneeze sound and slightly slower turbo spool. Your car and money though so it's your decision.
As you may know your car already has a dump valve, all turbo cars are fitted with one so its a matter of swapping, but beware if you do not fit a recirculating dump valve you may find a warning light on your dashboard as the ecu will register the drop in pressure as a leak, also you may find your performance will be worse, not better as the waste gases in a recirculatory dump valve are forced back in to keep the turbo spinning, so less lag
Is it a vent to air or recirculating one. Also it depends on manufacture, some are quieter than others, higher boost pressure will also make it sound louder but other factors are involved with this so I should take advise from your local shop.