P0133 on Nissan
O2 Sensor Circuit Slow Response (Bank 1, Sensor 1)
P0133 on Nissan vehicles indicates o2 sensor circuit slow response (bank 1, sensor 1). Au7o has documented this code across 1 Nissan model — most commonly on Frontier. This code indicates the upstream oxygen sensor on bank 1 is responding too slowly when switching between rich and lean readings. The computer relies on this sensor to react quickly so it can fine-tune the air-fuel mixture in real time. When the sensor's response time falls below specification, this code sets. It typically causes reduced fuel economy, higher emissions, and a failed emissions test, though drivability may be only mildly affected. Typical repair costs on Nissan range from $400 to $1,400, depending on the specific model and root cause.
Common Causes of P0133
- •Aged or contaminated upstream O2 sensor (bank 1)
- •Exhaust leak near the sensor
- •Vacuum leak affecting air-fuel ratio
- •Wiring or connector corrosion at the sensor
- •Contaminated sensor (oil, coolant, or silicone)
- •Low fuel pressure or fuel delivery issues
- •Faulty sensor heater circuit slowing warm-up
P0133 on Nissan by Model
Nissan Frontier(1 issue)
- Exhaust Manifold Stud Breakage and Manifold Leak Tick2000-2004
A common first-gen Frontier issue is broken exhaust manifold studs, especially on the VG33E/VG33ER V6. Heat cycling warps the manifold and stresses the studs until one or more snap, creating a ticking exhaust leak that is loudest on cold start. Owners often mistake it for valvetrain noise, but the sound usually fades somewhat as the manifold heats up and expands.
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View P0133 across all makes →Frequently Asked Questions
What does P0133 mean on Nissan?▼
P0133 stands for "O2 Sensor Circuit Slow Response (Bank 1, Sensor 1)." This code indicates the upstream oxygen sensor on bank 1 is responding too slowly when switching between rich and lean readings. The computer relies on this sensor to react quickly so it can fine-tune the air-fuel mixture in real time. When the sensor's response time falls below specification, this code sets. It typically causes reduced fuel economy, higher emissions, and a failed emissions test, though drivability may be only mildly affected. On Nissan specifically, this code is documented across 1 model.
What causes P0133 on Nissan vehicles?▼
Common causes on Nissan: Aged or contaminated upstream O2 sensor (bank 1), Exhaust leak near the sensor, Vacuum leak affecting air-fuel ratio, Wiring or connector corrosion at the sensor, Contaminated sensor (oil, coolant, or silicone). Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix P0133 on a Nissan?▼
Repair costs on Nissan range from $400 to $1,400, depending on the specific model and root cause.
Which Nissan models have P0133 documented?▼
Au7o has documented P0133 on 1 Nissan model: Frontier.