O2 Oxygen Sensor Upstream Downstream for Nissan Frontier Xterra (2000-2003) 3.3L

Direct-Fit Upstream & Downstream O2 Oxygen Sensor Kit for 2000-2003 Nissan Frontier,Xterra (D22 / WD22)

What it Does: This 4-piece direct-fit oxygen sensor kit replaces both upstream and downstream exhaust gas monitors on 2000-2003 Nissan Frontier and Xterra D22 and WD22 models with the VG33E 3.3L V6 to maintain closed-loop air-fuel ratio accuracy and verify catalytic converter efficiency.

The Stock Nissan Frontier,Xterra Oxygen Sensor Failure

Factory oxygen sensors on the D22 Frontier and WD22 Xterra equipped with the VG33E 3.3L V6 endure extreme exhaust manifold heat soak and moisture cycling. Over time, carbon soot, oil vapor, and thermal shock fracture the internal zirconia ceramic element or burn out the integrated heater circuit. Once internal resistance spikes or sensing response slows, the ECM loses accurate bank-1 and bank-2 lambda feedback, triggering P0130, P0135, P0150, and P0155 fault codes.

Common Symptoms of a Failing OEM Oxygen Sensor

• Check Engine Light / DTCs: Persistent heater circuit and slow-response codes including P0135, P0155, P0133, or false catalyst efficiency warnings like P0420/P0430.
• Voltage Switching Lag: Sluggish upstream signal oscillation between 0.1V and 0.9V forces the ECM into rich open-loop fuel trim compensation.
• Drivability & Emissions Impact: Noticeable drop in fuel economy, rough idle, hesitation under load, and failed state tailpipe emissions testing.

The Direct-Fit 4-Sensor Zirconia Solution

This matched 4-sensor kit restores factory closed-loop fuel metering with durable stainless-steel housings, high-temperature ceramic zirconia sensing cores, and OEM-calibrated internal heaters. Engineered to replace 234-3089, 234-3098, and 234-4703, every sensor features pre-terminated factory-style weatherproof connectors and exact harness lengths for bank-1 and bank-2 routing. Threads install directly into existing manifold and exhaust pipe bungs with zero wire splicing or exhaust modification required.

What's Included

• 2 Upstream Oxygen Sensors
• 2 Downstream Oxygen Sensors

Technical Specifications

Compatibility

• 2000-2003 Nissan Frontier 3.3L V6 (4-Sensor Setup: 2 Upstream, 2 Downstream)
• 2000-2003 Nissan Xterra 3.3L V6 (4-Sensor Setup: 2 Upstream, 2 Downstream)

Frequently Asked Questions & Fitment Warnings

Does this fit the D22 / WD22 Frontier,Xterra?

Yes. This is a direct fit for the 2000-2003 Nissan Frontier,Xterra equipped with the VG33E 3.3L V6 engine. Excludes 2.4L inline-4 (KA24DE) models; verify your vehicle uses the 4-sensor (2 upstream, 2 downstream) layout before ordering.

Will replacing all four sensors clear P0135, P0155, or P0420/P0430 codes?

Yes, if caused by sensor failure. Fresh upstream units resolve heater circuit faults like P0135 and P0155 while stabilizing fuel trims, though persistent P0420/P0430 codes after downstream replacement indicate depleted catalytic converter substrate.

Do these sensors require wire splicing or special hardware for installation?

No. Each sensor arrives with OEM-style plug-and-play connectors; simply chase rusted exhaust bung threads, apply sensor-safe anti-seize to the threads only, and torque to 25–30 ft-lbs.

The Nissan Heavy-Duty Standard

Built to withstand sustained exhaust gas temperatures under trail climbs and towing loads, this matched sensor set keeps your VG33E 3.3L V6 fueling balanced across both cylinder banks. Restoring crisp upstream and downstream feedback eliminates sluggish throttle response and protects your catalytic converters from thermal damage.