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To replace the O2 sensor on a 2001 Audi TT Quattro, first ensure the engine is cool and disconnect the battery. Locate the O2 sensor, which is typically found in the exhaust system—either before or after the catalytic converter. Use a wrench or O2 sensor socket to carefully unscrew the old sensor and disconnect the wiring harness. Install the new sensor by reversing the process, ensuring it’s securely fastened and reconnecting the battery.

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