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O2 sensors

On turbos are there any real symptoms of a failing or failed o2 sensor?
Could my 1.3 bar bog be caused by it? I was under the impression that
maybe symptoms of a failing sensor are gradual and you don't really notice
it until you change the sensor. Do higher boost levels affect it's life?
Audis are built around the airbox? I say they're (at least turbos) built
around the o2 sensor.

'84  5ksT 1.8 bar adjustable