O2 Oxygen Sensor Upstream Downstream for Nissan Frontier (2008-2010) 4.0L

Direct-Fit Upstream & Downstream Oxygen Sensor Kit for 2008-2010 Nissan Frontier (D40)

What it Does: This 4-piece oxygen sensor kit monitors pre- and post-catalyst exhaust oxygen levels on the 2008-2010 Nissan Frontier (D40) VQ40DE 4.0L V6 to regulate air-fuel trim and catalyst efficiency.

The Stock Nissan Frontier Oxygen Sensor Failure

Over extended mileage and severe thermal cycling, factory D40 oxygen sensors on the VQ40DE 4.0L V6 suffer silicone contamination, carbon fouling, and internal heater circuit burnout. Upstream wideband air-fuel sensors develop sluggish lambda response, skewing closed-loop fuel trims under load. Simultaneously, downstream heated zirconia elements experience ceramic micro-fractures from exhaust condensation and vibration, triggering persistent ECU fault codes including P2A00, P2A03, P0138, and P0158.

Common Symptoms of a Failing OEM Oxygen Sensor

• Check Engine Light / DTCs: Active P2A00, P2A03, P0138, P0158, or P0420/P0430 codes from sluggish voltage switching.
• Rich Exhaust / Fuel Loss: Unburned fuel odor, tailpipe soot, and reduced MPG from skewed lambda feedback.
• Drivability & Emissions Failure: Rough idle, throttle hesitation, or incomplete readiness monitors failing emissions testing.

The Direct-Fit 4-Sensor Oxygen Sensor Solution

Replacing all four sensors as a matched set restores balanced Bank 1 and Bank 2 closed-loop fuel control across the VQ40DE 4.0L V6. Each unit features a laser-welded 310S stainless steel protective shield, PTFE breather membrane, and precision zirconia ceramic sensing element for rapid light-off and accurate voltage switching. Factory-length harnesses and OEM-style weatherproof connectors ensure plug-and-play installation without cutting or splicing.

What's Included

• 2 Upstream Oxygen Sensors
• 2 Downstream Oxygen Sensors

Technical Specifications

Compatibility

• 2008 Nissan Frontier (4.0L V6)
• 2009 Nissan Frontier (4.0L V6)
• 2010 Nissan Frontier (4.0L V6)

Frequently Asked Questions & Fitment Warnings

Does this fit the D40 Frontier?

Yes. This fits 2008-2010 Nissan Frontier trucks equipped with the VQ40DE 4.0L V6 engine. Excludes 2.5L I4 trims; confirm engine displacement before ordering.

Will this clear P2A00, P0138, or P0420 codes?

Yes, when sensor degradation is the cause. Matched upstream (P2A00/P2A03) and downstream (P0138/P0158) units restore ECU feedback, though damaged catalysts triggering P0420/P0430 require separate inspection.

Are OEM-style connectors included for installation?

Yes. Pre-terminated harnesses plug directly into factory sockets; install using a 22mm oxygen sensor socket and torque to factory specifications.

The Nissan Heavy-Duty Standard

Built for towing loads and severe exhaust heat soak, this matched 4-sensor kit keeps your D40 Frontier running at stoichiometric efficiency. Accurate lambda feedback protects catalytic converter longevity and maintains dependable V6 throttle response.