Powertrain
generic / SAE
P0133
O2 Sensor Slow Response (Bank 1, Sensor 1)
The upstream oxygen sensor switches between rich and lean too slowly. Aged sensors lose response speed before they fail outright; this code typically appears before P0130/P0131/P0132.
SystemPowertrain
Typegeneric / SAE
GroupP0
Range / number1 / 33
Possible causes
- Oxygen sensor aged high
- Sensor partially poisoned (silicone, lead, sulphur) medium
Symptoms
- Check engine light on
- Increased fuel consumption
- Possible rough idle or hesitation
- Failed emissions test
Inspection / repair
- Difficulty: easy
- DIY: possible
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References
sae:J2012