O2 Oxygen Sensor Upstream Downstream for Mitsubishi Eclipse (2006-2012) 2.4L

Direct-Fit Upstream & Downstream O2 Oxygen Sensor Kit for 2006-2012 Mitsubishi Eclipse (DK2A / DK4A)

What it Does: This four-piece upstream and downstream oxygen sensor kit monitors pre- and post-catalyst exhaust gas oxygen levels on the 2006-2012 Mitsubishi Eclipse DK2A / DK4A equipped with the 4G69 2.4L engine to regulate closed-loop fuel trims.

The Stock Mitsubishi Eclipse Oxygen Sensor Failure

Over high mileage, the factory zirconia sensing elements and internal heater circuits on the DK2A / DK4A platform's 4G69 2.4L engine degrade from extreme exhaust heat soak, thermal cycling, and carbon or silicone contamination. Because this dual pre-catalyst exhaust manifold utilizes four separate sensors, a single sluggish Bank 1 or Bank 2 unit skews short-term fuel trims and triggers fault codes such as P0134, P0135, P0141, or false P0420/P0430 catalyst efficiency alerts.

Common Symptoms of a Failing OEM Oxygen Sensor

• Check Engine Light & Heater DTCs: Internal heater circuit burnout or lazy voltage switching triggers P0134, P0135, P0141, or P0161.
• Erratic Fuel Trims: Contaminated sensor tips delay narrowband voltage feedback, forcing rich open-loop fueling.
• Emissions Failure & MPG Loss: Inaccurate downstream monitoring skews catalyst diagnostics and increases fuel consumption.

The Direct-Fit 4-Sensor Zirconia Solution

This matched four-sensor kit replaces both upstream air-fuel monitoring and downstream catalyst-monitoring positions simultaneously to restore uniform voltage switching across both exhaust banks. Built with laser-welded stainless steel bodies, porous protective shields, and fast-acting ceramic heater elements, each direct-fit sensor threads directly into the factory manifold and mid-pipe bungs. Pre-terminated OEM-style electrical connectors and factory-length harnesses eliminate splicing, ensuring clean ECM signal integrity and reliable closed-loop fuel control.

What's Included

• 2x Upstream Oxygen Sensors
• 2x Downstream Oxygen Sensors

Technical Specifications

Compatibility

• 2006-2012 Mitsubishi Eclipse 2.4L (4-Sensor Upstream & Downstream Configuration)

Frequently Asked Questions & Fitment Warnings

Does this fit the DK2A / DK4A Eclipse?

Yes. This is a direct fit for the 2006-2012 Mitsubishi Eclipse equipped with the 4G69 2.4L engine. Excludes 3.8L V6 models and Galant 2.4L vehicles; verify your 4-sensor pre-catalyst manifold configuration before ordering.

Will replacing all four sensors clear P0135, P0141, and fuel-trim codes?

Yes, if faulty sensors caused the DTC. Installing a matched set restores heater resistance and voltage switching speed on the 4G69 2.4L, though lingering P0420/P0430 codes indicate depleted pre-catalysts.

Are the electrical connectors plug-and-play without wire splicing?

Yes. All four sensors feature OEM-style weatherproof connectors; install into cool exhaust bungs, torque to factory spec, and clear stored ECM codes afterward.

The Mitsubishi Precision Standard

Engineered for JDM-platform efficiency, replacing all four oxygen sensors simultaneously keeps closed-loop fueling sharp and exhaust flow monitoring accurate under load. Expect crisp throttle response, balanced fuel trims, and consistent emissions readiness.