Code p0492 - 2004 Volkswagen Passat

Did you check the Vacuum lines to the Secondary air Valve Controls. They may be rotten. Can you do a Smoke test. Replace dry rotted lines with either 3/16 Fuel or Power Steering Hoses if you do not get ORM Vacuum lines/hoses. There are many Vedios on You Tube showing this specific problem solving on German cars. you can check out these,
Secondary Air Injection Systems on German Vehicles E39) 2001 BMW 525i Resolve P0491/P0492 for less than $2.00 in approx 15min. How to Fix and Diagnose BMW P0491 P0492 Secondary Air / Vacuum Leak E36 E46 E39 E53

I’m happy to assist further over the phone at https://www.6ya.com/expert/uttamjeet_2f3adc18600f8ede

smog pump ? There is no such thing . What size engine does your ION have ? 2.0 , 2.2 ,2.4 L Has
secondary air injection system .
Secondary Air Injection Pump P0410 P0411 P0412 P0491 P0492

these refer to the secondary air intake system , insufficient flow . this could be an electrical fault or a component such as the relay , solenoid etc, follow this link for more info
BMW Secondary Air System Fault Code Diagnosing How To DIY OBD II

P0491 Secondary Air Injection System (Bank 1)
P0492 Secondary Air Injection System (Bank 2)
Good luck for you!
OBD2 code reader

it can be the turbo

P0492 Secondary air flow low.There are updated ventalation hoses did they use those? See if recall 06E-A02 crankcase ventilation valve replacement is in effect in your state this may not apply to the 7 series

code p 0368 refers to a camshaft position sensor B bank 1 -- circuit high===causes wiring short to positive --CMP sensor--ECM
code p 0492 refers to secondary air injection system bank 2---malfunction===causes wiring---AIR solenoid ---hose connections ---mechanical fault
playing with a climate control setting will not affect those codes so I suspect that you are being given the old run around
find yourself an accredited professional service center that has experience on your make of car and get a proper diagnosis and quote or if you have any sort of used car warranty , take it back and don't let them fool you again as you now have the codes facts

it will have to be fixed or it wont pass inspection

the big brain

this is what the code means
P0492
Secondary Air Injection System (Bank 2)

I'm not sure if you fixed your problem yet but I had some similar gremlins on my 2001 540. Just a word of advice. Ensure that the tube from the air pump to the manifold is clear. This can occasionally get blocked and this is what causes the air pump to over heat and fail in the first place. after replacing a couple of air pumps, I learned this the hard way.