P0133Severity: Medium
P0133 – Oxygen Sensor Slow Response (Bank 1 Sensor 1)
The upstream O2 sensor switches between lean/rich too slowly.
What it means
The response time of the pre-catalyst oxygen sensor is longer than normal. It usually indicates an aged sensor.
Symptoms
- Increased fuel use
- Slight power loss
- Failed emissions test
Common causes
- Aged O2 sensor
- Sensor contamination (silicone/lead)
- Exhaust leak
- Weak sensor heating
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Frequently asked questions
What does trouble code P0133 mean?
P0133 – Oxygen Sensor Slow Response (Bank 1 Sensor 1). The response time of the pre-catalyst oxygen sensor is longer than normal. It usually indicates an aged sensor.
Can I drive with a P0133 code?
You can usually drive short distances, but it's best to have it checked before it gets worse.