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P0133

Overview

Code

P0133

Code Type

P

Code Class

P0

System

Engine, Emissions

Severity Level

Low

Emissions Related

true

Drivability Impact

Minor

Diagnostic Protocol

OBD2

Freeze Frame Useful

true

Code Definition

Diagnostic trouble code P0133 indicates a slow response from the oxygen sensor circuit for Bank 1 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

Slow O2 sensor response affects fuel trim adjustment and emissions performance

Possible Causes

Aging oxygen sensor; Sensor contamination; Exhaust leaks

Diagnostic Steps

1 Confirm the fault code; 2 Monitor O2 sensor response time; 3 Inspect exhaust for leaks; 4 Replace the oxygen sensor if response is slow

Drive Safety Notes

Driving is generally safe, but emissions efficiency is reduced

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