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P0155

Overview

Code

P0155

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 P0155 indicates a malfunction in the oxygen sensor heater circuit for Bank 2 Sensor 1

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 heater circuit ensures fast oxygen sensor warm-up for closed-loop operation

Possible Causes

Faulty oxygen sensor heater; Wiring or fuse issues

Diagnostic Steps

1 Confirm the fault code; 2 Inspect heater wiring and fuse; 3 Measure heater resistance; 4 Replace the oxygen sensor if faulty

Drive Safety Notes

Driving is safe, but cold-start emissions may increase

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