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04 Secondary Air Injection Issues

Cameron Tam
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Cameron Tam Member

Cameron Tam

Posted
Posted (edited)

started with P0491 & P0492 CEL that came on after a day driving the car after reset. 

 

Long story short:

Pump works, so moved onto cut off valve since CEL is both banks

Used a tutorial on here where the poster poured seafoam on cold start into the secondary intake pipe to test for leak

seafoam "cloud" came out only on the passenger side exhaust pipe and not the driver side

 

Im guessing because of this there might be a blockage? Where should i look to next? thanks for your help!

Edited by Cameron Tam
  • Admin
Loren Member

Loren

Posted
  • Admin
Posted

Lots here if you do a Search...

 

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 connector (perhaps they left it unplugged) then fuse (40A on relay panel near DME).

DK570 Member

DK570

Posted
Posted

I solved my codes by pretty much replacing all the SAI vacuum lines.  Take a look at the thread here: 

 

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