top of page

P0156

Overview

Code

P0156

Code Type

P

Code Class

P0

System

Engine, Emissions

Severity Level

Low

Emissions Related

true

Drivability Impact

None

Diagnostic Protocol

OBD2

Freeze Frame Useful

true

Code Definition

Diagnostic trouble code P0156 indicates a malfunction in the oxygen sensor circuit for Bank 2 Sensor 2

Symptoms

Check Engine Light illuminated

Overview applies to this diagnostic code.

Affected Systems

On This Page

  • Code Definition

  • Symptoms

  • Affected Systems

  • Possible Causes

  • Diagnostic Steps

  • Drive Safety Notes​

More Resources

The downstream oxygen sensor monitors catalytic converter efficiency

Possible Causes

Faulty oxygen sensor; Wiring or connector issues

Diagnostic Steps

1 Confirm the fault code; 2 Inspect wiring and exhaust system; 3 Monitor live O2 sensor data; 4 Replace the oxygen sensor if needed

Drive Safety Notes

Driving is safe, but emissions monitoring may be affected

bottom of page