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P0140

Overview

Code

P0140

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 P0140 indicates no activity detected in the oxygen sensor circuit for Bank 1 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

Lack of downstream O2 activity prevents accurate catalytic converter monitoring

Possible Causes

Failed oxygen sensor; Open circuit in wiring

Diagnostic Steps

1 Confirm the fault code; 2 Inspect wiring and connectors; 3 Monitor sensor activity; 4 Replace the oxygen sensor if inactive

Drive Safety Notes

Driving is safe, but emissions readiness monitoring may not complete

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