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P0151

Overview

Code

P0151

Code Type

P

Code Class

P0

System

Engine, Emissions

Severity Level

Medium

Emissions Related

true

Drivability Impact

Minor

Diagnostic Protocol

OBD2

Freeze Frame Useful

true

Code Definition

Diagnostic trouble code P0151 indicates low voltage in the oxygen sensor circuit for Bank 2 Sensor 1

Symptoms

Check Engine Light illuminated; Poor fuel economy

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

Low O2 sensor voltage affects fuel trim and emissions control

Possible Causes

Faulty oxygen sensor; Exhaust leaks; Wiring short to ground

Diagnostic Steps

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

Drive Safety Notes

Driving is possible, but emissions performance may degrade

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