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Home/DTC Codes/Audi/A6/2014-2014 3.0L Supercharged V6/P0155
P0155

O2 Sensor Heater Circuit Bank 2 Sensor 1

2014-2014 Audi A6 3.0L Supercharged V6

Low SeverityPowertrainGeneric (SAE)

The 2014 Audi A6 is equipped with a 3.0L V6 engine. Below you'll find detailed p0155 diagnostic code information including labor time estimates, cost ranges, and technician notes specific to this engine configuration.

Description

Malfunction in the upstream O2 sensor heater on Bank 2.

Symptoms

  • Check Engine Light
  • Extended warmup emissions

Common Causes

  • Faulty heater
  • Blown fuse
  • Wiring issue

Diagnostic Steps

  1. Check fuse
  2. Test heater resistance
  3. Inspect wiring

Repair Notes

Replace O2 sensor.

Related Codes

P0050HO2S Heater Control Circuit Bank 2 Sensor 1P0150O2 Sensor Circuit Bank 2 Sensor 1P0154O2 Sensor Circuit No Activity Bank 2 Sensor 1

Other Powertrain Codes

P0155 on Other Vehicles

Audi A3

1996-1996 1.6L I4

Audi A3

1996-1996 1.8L Turbo I4

Audi A3

1997-1997 1.6L I4

Audi A3

1997-1997 1.8L Turbo I4

Audi A3

1998-1998 1.6L I4

Audi A3

1998-1998 1.8L Turbo I4

Audi A3

1999-1999 1.6L I4

Audi A3

1999-1999 1.8L Turbo I4 Quattro

Common Questions

What does code P0155 mean on a 2014-2014 Audi A6?

P0155 stands for "O2 Sensor Heater Circuit Bank 2 Sensor 1". Malfunction in the upstream O2 sensor heater on Bank 2.

What are the symptoms of P0155 on a Audi A6?

Common symptoms of P0155 include: Check Engine Light, Extended warmup emissions.

What causes P0155 on a 2014-2014 Audi A6?

Common causes of P0155 include: Faulty heater, Blown fuse, Wiring issue.

Last updated: March 2026

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