System: Powertrain (P-Code)
SAE Standard (Generic)
Family: O2 Sensor Slow Response
Code P0133: O2 Sensor Circuit Slow Response Bank 1 Sensor 1
Diagnostic & Technical Explanation
Code P0133 (O2 Sensor Circuit Slow Response Bank 1 Sensor 1) sets when an oxygen sensor takes longer than the calibrated time to transition between rich and lean voltage states. This is typically a sensor element that has aged or been contaminated by silicone, oil ash, or coolant, though an exhaust leak that dilutes the sample can also slow the switching response.
First-listed procedure
Rank #1
Inspect for contamination sources (oil, coolant, silicone) reaching the exhaust
Easy DIY
This is the first procedure in the authored
consideration order, not a measured cause likelihood. Execute it only when its prerequisites
and diagnostic findings support it. Its cost and labor estimates (where known), the step-by-step procedure and the
remaining 2 procedure(s) are in the licensed dataset. Ordering context.
Full family: O2 Sensor Slow Response
What this page does not show
This page publishes the fault mechanism and the code index. The licensed dataset adds, for
every one of the 15,886 codes, the full authored repair set (56,729 procedures in total)
with the fields deliberately withheld here:
- Procedures 2..n after the first-listed procedure
- Aftermarket parts cost ranges in USD (
est_parts_cost_min/max_usd)
- Professional labor-hour estimates (
est_labor_hours)
- Step-by-step diagnostic and repair instructions
- Replacement-part mappings and catalog lookups
- 6,637 manufacturer-specific OEM codes across 32 makes ($149 tier)