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2005 porsche 997 2s airbag light on problem

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I have on a 2005 porsche carrera 2s coupe.

I have bought the car in US with a front left side damaged clean title.

I have replaced the following airbags : driver, passenger, left door, left seat, and also airbag control unit 99761821708, airbag fender sensor, front left side belt.

I have bought all the parts used but the left door airbag is new.

Is there something to do with used parts to identify them with the car?

The airbag light stay on where the car is running and when the key is inside, the airbag light is flashing.

All the connectors on the airbags are ok and locked.

The porsche guy can't made the airbag light on with the piwi. He says the it need to check all airbags separately.

I have a lot of errors :

8055 AWS-LIN : no communication

8056 AWS-LIN : signal implausible


If somebody can help me.

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