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Not sure if I posted this in the wrong place, or even if I've got it right this time. I've got a 2004 audi a3 2.0 tdi and I know a rear crash sensor has gone and the air bag light is on. Basically, is there more than 1 sensor, if so how can I find out which one it is and how easy are they to...

Hi all. I've got a 2004 audi a3 2.0 tdi. I know that the rear crash sensor has gone off and the airbag light is on. I was wondering a few things really. Is there more than 1 crash sensor, how can I find which one it is if there are more than 1, and are they easy to change? Thanks for any help.