Repeating CEL, I have the codes...Please help

[mookster]

2003 996 Cab, 68k miles

I have the Durametric code reader software

The check engine light has come on 2 times with the following codes

P0491 Secondary air system bank 1

P0492 Secondary air system bank 2

And 9114 PCM control unit. The software does not allow me to clear this code

Any help with the codes and cause is greatly appreciated.

[Loren]

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

[mookster]

Time to finish the thread.

The final problem was a leaking vacuum reservoir (part 933 110 140 03) behind/lower then the alternator. I would never had found this leak as a DIYer. The shop smoke tested the system and found the leak. The leak was not obvious thus the post and part number.

part $27

Diagnostic prior to repair 1.5 hours

Alternator R&I 1.0

Retest 1 hour