P0133 on Nissan: How to Diagnose & Fix
O2 Sensor Circuit Slow Response (Bank 1, Sensor 1)
1 Nissan model · 1 documented issue · $400-$1,400 repair
P0133 on Nissan by model: symptoms, diagnosis and fix
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.
Common Symptoms
- ticking noise on cold start
- exhaust smell in engine bay
- louder under acceleration
- possible oxygen sensor or lean codes
- reduced cabin comfort from exhaust odor
How to Fix
Diagnosis involves listening for a cold-start tick at the manifold, checking for soot marks, and inspecting for missing or broken studs. Proper repair usually means removing the manifold, extracting broken studs, resurfacing or replacing warped manifolds, and installing updated hardware and gaskets; simply tightening remaining fasteners rarely lasts.
What you need to fix it
Only diagnosis- and fitment-reviewed repair parts are linked here.
- Genuine Nissan right exhaust manifold 14004-4S103
1998-2004 Frontier 3.3L applications on the live fitment table; confirm VIN, emissions label and current supersession.
- Genuine Nissan left exhaust manifold with catalyst 14002-EK810
Not a regular VG33E left-manifold solution; confirm VIN and emissions label.
- Genuine Nissan exhaust manifold gasket 14036-0W000
Quantity depends on the disturbed side or sides; confirm VIN.
- Genuine Nissan exhaust manifold stud 14064-7B00A
1998-2004 Frontier 3.3L applications on the live fitment table. Determine quantity from the failed/removed hardware and current service information.
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Owner tips & cautions
- TipIf the manifold is off, replace all studs and use quality gaskets; many owners report repeat leaks when only one broken stud is repaired.
Sources for this issue (1)
P0133 code reference
General diagnostic-code context. The code alone does not confirm a cause for your vehicle; use the applicable issue card and its sources.
Frequently asked questions
What does P0133 mean on a 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 it is documented across 1 model: Frontier.
What are the most common causes of P0133?
The most common causes of P0133 are: 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. The specific cause varies by vehicle.
How much does it cost to fix P0133 on a Nissan?
Published repair estimates on Nissan range from $400 to $1,400 depending on the model and root cause. If an issue mentions a recall or campaign, check your VIN with the manufacturer or NHTSA and confirm eligibility and coverage with a dealer.
Looking for P0133 on a different make?
View P0133 across all makes →Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.