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P0139

O2 Sensor Circuit Slow Response Bank 1 Sensor 2

2016-2016 Audi TT 2.0L Turbo I4

Low SeverityPowertrainGeneric (SAE)

The 2016 Audi TT is equipped with a 2.0L inline-4 turbocharged gasoline engine. Below you'll find detailed p0139 diagnostic code information including labor time estimates, cost ranges, and technician notes specific to this engine configuration.

Description

The downstream O2 sensor on Bank 1 is responding too slowly.

Symptoms

  • Check Engine Light
  • Failed emissions

Common Causes

  • Aging sensor
  • Contaminated sensor
  • Catalyst issue

Diagnostic Steps

  1. Monitor sensor response
  2. Check catalyst efficiency

Repair Notes

Replace downstream O2 sensor.

Related Codes

P0136O2 Sensor Circuit Bank 1 Sensor 2P0140O2 Sensor Circuit No Activity Bank 1 Sensor 2

Other Powertrain Codes

P0139 on Other Vehicles

Common Questions

What does code P0139 mean on a 2016-2016 Audi TT?

P0139 stands for "O2 Sensor Circuit Slow Response Bank 1 Sensor 2". The downstream O2 sensor on Bank 1 is responding too slowly.

What are the symptoms of P0139 on a Audi TT?

Common symptoms of P0139 include: Check Engine Light, Failed emissions.

What causes P0139 on a 2016-2016 Audi TT?

Common causes of P0139 include: Aging sensor, Contaminated sensor, Catalyst issue.

Last updated: March 2026

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