You are offline — AutoTools still works from your device.

Code

P0133

Emissions

O2 sensor slow response — Bank 1 Sensor 1

The upstream oxygen sensor responds too slowly.

Search another code

Most likely causes

Aging O2 sensor
Contaminated sensor
Exhaust leak

Symptoms you may notice

Check engine light
Worse economy

Checks to run

Watch O2 switching rate
Test the sensor
Check for leaks

Tools you may need

OBD-II scanner Multimeter

Always diagnose before replacing. Codes share symptoms; confirm the cause with measurements before buying parts.

Related codes in Emissions

Catalyst system efficiency below threshold — Bank 1

Oxygen sensor circuit malfunction — Bank 1 Sensor 1

Oxygen sensor heater circuit malfunction — Bank 1 Sensor 1

Oxygen sensor heater circuit malfunction — Bank 1 Sensor 2

Oxygen sensor circuit low voltage — Bank 1 Sensor 1

Ask the AI mechanic

Hi! Ask me anything about your car — codes, noises, parts, maintenance.