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2014 AUDI A6

3.0L Supercharged V6•AWD•AUTOMATIC•gas•supercharged
4 active safety recalls on this vehicle — view recalls
Repairs0Labor991Torque6374Fluid15DTC1816Battery0Maintenance0Recalls4
P0138moderate severityPowertrain

O2 Sensor Circuit High Voltage Bank 1 Sensor 2

on 2014 Audi A6 3.0L Supercharged V6 · AWD

What this code means

The downstream O2 sensor on Bank 1 is reading high voltage consistently.

Symptoms

  • Check Engine Light
  • Failed emissions
  • May indicate catalyst failure

Common causes

  • Faulty sensor
  • Catalytic converter failure
  • Rich running condition

Diagnostic steps

  1. Test sensor voltage
  2. Check catalyst efficiency
  3. Monitor upstream vs downstream O2 patterns

Repair notes

Replace sensor. If catalyst failed, replace catalytic converter.

Other Powertrain codes on this vehicle

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