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4 fault codes after getting car back


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Very unhappy with my recent visits(s) to independent Porsche tech; received car back after they installed a new fuel sending unit seeing there was a 0442 code; the next day after receiving car back check engine light came on with following codes:

0492

0491

0071

0074

Any suggestion what it could be; maybe something unplugged? I don't want to take it back there just for them to start replacing everything; $3K last week was enough.

Any help or input would be appreciated

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P0071 Fault entry in specified control module
P0074 Fault entry in specified control module
 
Possible fault causes
- Control module is incorrectly coded
- Periphery connected to specified control module is incorrect
- Control module faulty (in most cases the cause is not the control module but incorrect coding!)
 
P0491 Secondary-air system
P0492 Secondary-air system
 
Possible fault causes
- Secondary air pump relay mechanically faulty (jams)
- Power supply for secondary air pump faulty
- Air duct cross section narrowed (pinched / blocked)
- Electric switch-over valve does not function
- Pneumatic switch-over valve does not function
- Leak in vacuum system
- Secondary air pump electrically or mechanically faulty
 
Take it back and have them correct the faults.
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