Oxygen Sensors for Acura TSX (2004-2008) 2.4L Upstream

Direct-Fit Upstream Oxygen Sensor for 2004-2008 Acura TSX

What it Does: The Upstream Oxygen Sensor measures exhaust gas oxygen concentration ahead of the catalytic converter on the 2004-2008 Acura TSX to provide critical closed-loop feedback for precise air-fuel ratio management.

The Stock Acura TSX Lambda Sensor Degradation

Over thousands of heat cycles and prolonged exposure to exhaust contaminants, the factory upstream air-fuel ratio sensor on the K24A2 engine experiences thermal fatigue, ceramic substrate contamination, and internal heater element breakdown. This physical degradation dampens sensor response times, causing the powertrain control module to receive delayed signal feedback. The resulting latency skews Short-Term and Long-Term Fuel Trims (STFT/LTFT), inducing uneven idle, sluggish off-idle throttle response, reduced fuel economy, and persistent diagnostic trouble codes such as P0134 or P0135.

The Engineering Solution

This replacement upstream sensor utilizes a fast-reacting planar zirconia element engineered for rapid light-off and continuous closed-loop monitoring. Housed in corrosion-resistant 304 stainless steel with precision-cut threads, it installs smoothly into the exhaust manifold bung without galling. High-temperature fluoropolymer wire insulation and sealed silicone boots protect the lead wires against extreme manifold thermal radiation and road debris. The OEM-pinned connector integrates directly with the CL9 wiring harness to eliminate splicing, immediately stabilizing fuel delivery and restoring engine efficiency.

Technical Specifications

Compatibility

• 2004-2008 Acura TSX Base Sedan 2.4L 4-Cylinder (Chassis: CL9, Engine: K24A2)

Frequently Asked Questions

Does this fit the CL9 TSX?
Yes, this is a direct fit for the 2004-2008 Acura TSX equipped with the K24A2 engine.

Will this resolve a P0134 or P0135 diagnostic trouble code?
Yes, this sensor restores internal heater circuit continuity and signal communication, clearing upstream sensor-related check engine lights after an ECU reset.

The Acura Performance Standard

The high-revving K24A2 platform depends on real-time lambda accuracy to sustain clean VTEC crossover engagement and crisp transient response without running rich or fouling spark plugs.