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Home/DTC Codes/Cadillac/SRX/2007-2007 3.6L V6/P0155
P0155

O2 Sensor Heater Circuit Bank 2 Sensor 1

2007-2007 Cadillac SRX 3.6L V6

Low SeverityPowertrainGeneric (SAE)

The 2007 Cadillac SRX is equipped with a 3.6L 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

Cadillac ATS

2013-2013 2.0L Turbo I4

Cadillac ATS

2013-2013 2.5L I4

Cadillac ATS

2013-2013 3.6L V6

Cadillac ATS

2014-2014 2.0L Turbo I4

Cadillac ATS

2014-2014 2.5L I4

Cadillac ATS

2014-2014 3.6L V6

Cadillac ATS

2015-2015 2.0L Turbo I4

Cadillac ATS

2015-2015 2.5L I4

Common Questions

What does code P0155 mean on a 2007-2007 Cadillac SRX?

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 Cadillac SRX?

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

What causes P0155 on a 2007-2007 Cadillac SRX?

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

Last updated: March 2026

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