O2 Oxygen Sensor Upstream Downstream for Toyota Tacoma (2001-2004) 2.4L

Direct-Fit Upstream and Downstream Oxygen Sensor Kit for 2001-2004 Toyota Tacoma (N140/N150)

What it Does: The Upstream and Downstream Oxygen Sensor Kit replaces degraded factory exhaust sensors on the 2001-2004 Tacoma to restore accurate air-fuel ratio feedback, eliminate check engine lights, and recover lost fuel economy.

The Stock Toyota Tacoma Sensor Degradation

Factory zirconia and planar sensors on the 2RZ-FE platform endure thousands of high-heat cycles, unburned fuel residue, and oil blow-by. Over mileage, the stock internal ceramic substrate becomes carbon-fouled and sluggish. This thermal fatigue causes delayed closed-loop switching times, poor stoichiometric air-fuel control, tailpipe emissions spikes, and diagnostic trouble codes such as P0135, P0141, or catalyst degradation codes.

The Engineering Solution

Engineered to exact OEM specifications, this matched sensor pair restores real-time millivolt signal fidelity to the powertrain control module. Featuring laser-welded 304 stainless steel sensor bodies, dual-layer protective shielding, and factory-impedance ceramic heating elements, these units resist soot buildup and thermal shock. Precision direct-fit harness plugs and flange configurations match OEM cross-references 89467-35050 and 89465-09360, preventing signal resistance drift and erratic fuel trims.

What's Included

• 1x Upstream Oxygen / Air-Fuel Ratio Sensor
• 1x Downstream Oxygen Sensor

Technical Specifications

Compatibility

• 2001 Toyota Tacoma Base / DLX 2.4L L4
• 2002 Toyota Tacoma Base / DLX 2.4L L4
• 2003 Toyota Tacoma Base / DLX 2.4L L4
• 2004 Toyota Tacoma Base 2.4L L4

Frequently Asked Questions & Fitment Warnings

Does this fit the N140 / N150 Tacoma?

Yes, this is a direct fit for the 2001-2004 Toyota Tacoma equipped with the 2RZ-FE 2.4L engine. Does not fit 2.7L (3RZ-FE) or 3.4L V6 (5VZ-FE) models.

Do these sensors require wire cutting or splicing?

No, both sensors feature vehicle-specific wiring harness lengths and factory-style connectors for complete plug-and-play installation.

The Toyota Durability Standard

The first-generation Tacoma is built for rugged dependability and hard-working service; preserving precise closed-loop fueling safeguards your catalytic converter, stabilizes idle characteristics, and protects your engine under heavy payload hauling.