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Engine code P0491 & P0492

meach
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meach Member

meach

Posted
Posted

Purchased a 2002 996 CAB C4 2 weeks ago. Check engine light came on with these codes. Can anyone give me any DIY info before I take to Porsche mechanic? Thx!

  • Admin
Loren Member

Loren

Posted
  • Admin
Posted

:welcome:

P0491 Secondary Air Injection System, Bank 1 - Insufficient Flow

P0492 Secondary Air Injection System, Bank 2 - Insufficient Flow

Possible cause of fault

- Electrical fault in power supply or line between relay and secondary air injection pump

- Secondary air injection pump relay mechanically faulty

- Mechanical fault in electrical secondary air valve

- Pneumatic secondary air valve faulty/sluggish

- Electrical fault in secondary air injection pump

- Mechanical fault in secondary air injection pump or secondary air injection pump blocked

- Vacuum system leaking

- Air hose to secondary air injection pump slipped off or constricted

Check the fuse and relay to start. Also, make sure the secondary air is plugged in. Sometimes when work is done on the car the tech remove the pump and then forgets to plug it back in when they put in back together.

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