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2010 audi q5 3.2 replaced driver side head due to broken

Customer Question
tensioner....the used head that I...
2010 audi q5 3.2 replaced driver side head due to broken tensioner....the used head that I installed does not have the port to connect the secondary air system so now car throws code P0492 insufficient flow bank 2...car runs fine and no other codes are
coming up.what sets the code?can I put a whole in the exhaust manifold and connect to it...would that keep it from.setting the code again???
Submitted: 2 years ago.Category: Audi
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Answered in 9 hours by:
10/10/2015
Audi Mechanic: Eric, Automotive Repair Shop Manager replied 2 years ago
Eric
Eric, Automotive Repair Shop Manager
Category: Audi
Satisfied Customers: 33,188
Experience: Automotive Repair Shop Manager, Technician/JA Mentor
Verified

HI,

You need to install the correct head in order to resolve this.

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Customer reply replied 2 years ago
But what exactly detects the flow...the engine runs perfect,this is the only code,couldn't be rerouted?
Customer reply replied 2 years ago
Thank you for your effort but nobody replied as you see,I think it's fair that I get a refund
Audi Mechanic: gomi_otaku, Technician replied 2 years ago
gomi_otaku
gomi_otaku, Technician
Category: Audi
Satisfied Customers: 3,466
Experience: VW certified technician, Chicago VW/Audi Training Center, Seattle VW/Audi Academy
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The secondary air system is more complex than you first imagine. If you simply put a port into the exhaust, you would get exhaust pressure feeding to the secondary air pump all the time, destroying it. The normal system has a solenoid valve that can open to allow the secondary air flow through. I would contact the place you got the head and tell them they sent wrong part, as it can't be easily modified. It's not your fault, it is the vendor.

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Customer reply replied 2 years ago
I ASKED WHAT EXACTLY detects the insufficient flow not about how complex the system is and by the way is not that complex,few hoses, few valves sensors and a air pump,
Audi Mechanic: gomi_otaku, Technician replied 2 years ago

OK, that was ONE of your questions- you asked about re-routing the secondary air flow straight into the exhaust.

The O2 sensors determine the flow, based on the amount of oxygen in the exhaust (because, by design, oxygen is the ONLY thing they detect, they do not analyze your exhaust, just the oxygen balance, to determine combustion efficiency, etc)

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Customer reply replied 2 years ago
Thank you sir
Audi Mechanic: gomi_otaku, Technician replied 2 years ago

hopefully you can get this resolved

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Customer reply replied 2 years ago
Was thinking to make a metal line that would have a one way check valve on it from the combi valve to the exhaust manifold that way there is flow and with a valve installed the exhaust won't go back in the secondary air system....
Audi Mechanic: gomi_otaku, Technician replied 2 years ago

OK- I hope you are up to fabricating this- remember, the system has to be able to sustain exhaust temperatures and function thousands of times (optimally) Let me know how it goes.

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