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Have you removed the sensor from the exhaust stream, and done a free-air calibration? This needs to be done periodically. easy to do, there are instructions with your controller.
If that doesn't change anything, replace the sensor. It's a $60USDpart and you can get it at any Volkswagen or Audi dealer (or from an Innovate dealer). If you still don't believe the numbers head to a dyno and hook up to a tailpipe sniffer and your wideband at the same time to verify.
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