O2 Oxygen Sensor Upstream Downstream for Toyota Tundra (2000-2002) 4.7L

Direct-Fit Upstream & Downstream Oxygen Sensor Kit for 2000-2002 Toyota Tundra (UCK30)

What it Does: This matched 4-piece oxygen sensor kit monitors pre- and post-catalyst exhaust oxygen levels on the 2000-2002 Toyota Tundra UCK30 2UZ-FE 4.7L V8 (RWD) to regulate closed-loop fueling and catalyst efficiency.

The Stock Toyota Tundra O2 Sensor Failure

Factory zirconia sensing elements on the UCK30 Tundra with the 2UZ-FE 4.7L V8 endure severe thermal cycling over time. Internal heater coils fatigue and open-circuit from repeated heat soak, while carbon soot and oil ash glaze the ceramic tip and slow voltage switching. Once upstream or downstream sensors degrade, the ECU logs heater and circuit faults like P0135, P0141, P0155, and P0161, forcing rich open-loop fueling.

Common Symptoms of a Failing OEM Oxygen Sensor

• Check Engine Light / Heater DTCs: Triggers P0135, P0141, P0155, or P0161 from open heater circuits or sluggish voltage switching.
• Rich Running & Fuel Loss: Slow upstream response forces default fuel enrichment, hurting MPG and fouling plugs.
• Failed Emissions & Rough Idle: Delayed closed-loop fueling increases tailpipe hydrocarbons and destabilizes idle trims.

The Direct-Fit Matched Oxygen Sensor Solution

Replacing all four sensors as a matched set restores synchronized Bank 1 and Bank 2 fuel trims on the 2UZ-FE 4.7L V8. Built as direct-fit replacements for OEM numbers 234-4154 and 234-4169, these sensors feature factory-length harnesses and locking plugs for splice-free installation. Corrosion-resistant stainless housings withstand underbody exposure, while fast-acting zirconia elements deliver crisp stoichiometric voltage signals to the UCK30 ECM.

What's Included

• 2 Upstream Oxygen Sensors
• 2 Downstream Oxygen Sensors

Technical Specifications

Compatibility

• 2000-2002 Toyota Tundra 4.7L Rear-Wheel Drive (RWD) ONLY
• Not listed for 4WD models; confirm engine and drivetrain before ordering

Frequently Asked Questions & Fitment Warnings

Does this fit the UCK30 Tundra?

Yes. This is a direct fit for the 2000-2002 Toyota Tundra equipped with the 2UZ-FE 4.7L V8 RWD powertrain. 4WD models and 3.4L V6 trims are strictly excluded; confirm engine and drivetrain before ordering.

Will this clear P0135, P0141, P0155, or P0161 codes?

Yes, if faulty sensors are the cause. Replacing the matched set (234-4154 / 234-4169) resolves open heater circuits and slow switching, though you should inspect fuses and exhaust leaks first.

Are factory connectors included without splicing wires?

Yes. Each unit features direct-fit OEM connectors for the UCK30 harness with zero cutting required; chase the exhaust bung threads clean before torquing.

The Toyota Heavy-Duty Standard

Engineered for towing heat loads and high-mileage durability, matched O2 sensor replacement keeps your 2UZ-FE 4.7L V8 at peak stoichiometric efficiency. Maintain clean emissions compliance and reliable fuel trims on your UCK30 Tundra.