Durametric Fault Code on my 2004 Cayenne S

[fafa]

Hi, my porsche turn on the check engine, when i check them with durametric, they shows one fault code: P0492 Description: Secondary Air Injection System Bank 2, Short to ground or positive.

what have to do whit that ? which part i have to change ?

kind regards

Fernan

[Loren]

:welcome:

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

[wvicary]

Inspect the vacuum lines to the combi valves.

[hahnmgh63]

And when it is cold have somebody start it while you have your hand on the pump just to see if the electric air pump is working, either that or unplug the connector and put a 12V source to it. If the pump seems to be working properly then it is most likely a leak from a hose or a kink. Could be a combi valve gone bad but I would check the pump and hoses first.

[fafa]

Thanks to all, i go to check all possible cause you give me!!!

[voodoocat]

Hi, I had P0491 P0492, as well as other fault code indicating faulty cam position sensor. I have 04 CTT 60Kmi.

the 40A fuse in fusebox (next to brake fld reservoir) was blown. replacement resulted in another blown fuse.

so i removed and disassembled both secondary air injection pumps, those two things that look like oversized windsheild wiper motor.

The pump consist of motor and plastic vanes, that spin to pump air into the pipe/hose. the vanes have tight tolerance against the aluminum housing. i think over time, the motor bearing start to give, the vane (fin) contacted the housing, broke off and failed. the broken pieces were jammed all over inside the housing and motor wouldn't turn at all. Both pumps had same failure.

If this happened to you, i don't recommend to keep on replacing the fuse, or worse, put bigger fuse in it. you might overheat the motor and burn it up, or worse yet (if you put larger fuse), melt the wiring harness. 40Amps are a lot of current and can start a spark/fire.

Pump is about $150 a piece, but recommend to replace both. Don't recommend a used unit, you'll just get another failed pump soon. also note, the L and R pumps are different, don't buy 2 of the same. 7L5.959.253.A and 7L5.959.253.B

Durametric showed a lot of faults, initially cam position sensor fail. Some forums suspected diverter valve failure. I'm glad to check this and find the problem was easily accessible. You need to pull intake manifold to check CPS...