O2 Oxygen Sensor Upstream Downstream for Mitsubishi Outlander Sport (2011-2012) 2.0L

Direct-Fit Upstream & Downstream O2 Oxygen Sensor Kit for 2011-2012 Mitsubishi Outlander Sport (GA2W)

What it Does: This matched upstream and downstream oxygen sensor kit monitors exhaust air-fuel ratios and catalyst efficiency on the 2011-2012 Mitsubishi Outlander Sport (GA2W) 4B11 2.0L to maintain closed-loop fuel trim accuracy.

The Stock Mitsubishi Outlander Sport O2 Sensor Failure

Factory oxygen sensors on the GA2W chassis with the 4B11 2.0L engine endure extreme exhaust heat cycling that degrades internal heater circuits and zirconia elements. Over time, carbon fouling, oil ash, and condensation fracture the ceramic substrate or burn out the heater coil, slowing voltage switching. Lagging sensor response disrupts ECU fuel trim control and triggers P0134, P0135, or P0141 fault codes.

Common Symptoms of a Failing OEM O2 Sensor

• Check Engine Light & Heater DTCs: Triggers P0135, P0141, or P0171 when internal heater resistance spikes or signal voltage stalls.
• Rough Idle & Fuel Odor: Slow air-fuel switching forces open-loop enrichment, causing hesitation and unburned exhaust odor.
• Failed Emissions & Low MPG: Skewed feedback causes converter saturation, P0420 codes, and reduced fuel economy.

The Direct-Fit Oxygen Sensors Solution

Built as a direct-fit replacement for OEM numbers 1588A144, 1588A228, 234-5051, and 234-4114, this matched two-sensor kit restores factory voltage switching across both positions. Each unit features a corrosion-resistant stainless steel shell, laser-welded seams, and a fast-response ceramic element engineered against thermal shock. Factory-style weatherpack connectors and OEM harness lengths bolt directly into stock bungs with zero cutting or splicing.

What's Included

• 1 Upstream Oxygen Sensor
• 1 Downstream Oxygen Sensor

Technical Specifications

Compatibility

• 2011-2012 Mitsubishi Outlander Sport 2.0L (Excludes California Emissions; 2-sensor configuration)
• Excludes 2015-2018 2.4L applications, plus Lancer, Outlander, and RVR models

Frequently Asked Questions & Fitment Warnings

Does this fit the GA2W Outlander Sport?

Yes. This is a direct fit for the 2011-2012 Mitsubishi Outlander Sport equipped with the 4B11 2.0L engine. Excludes California emissions vehicles, 2015-2018 2.4L applications, and Lancer, Outlander, or RVR models.

Will this clear P0135/P0141 codes, and are both sensors included?

Yes. Replacing both upstream and downstream sensors clears P0135, P0141, and P0134 circuit faults caused by failed OEM units, assuming factory wiring and the catalytic converter are intact.

Are OEM-style connectors included for installation?

Yes. Both sensors include factory-style connectors for plug-and-play installation into stock exhaust bungs; confirm your vehicle uses the 2-sensor Federal emissions layout before ordering.

The Mitsubishi Precision Standard

Built for JDM crossover reliability, replacing both sensors together restores crisp throttle response, balanced fuel trims, and emissions compliance without triggering check engine lights.