O2 Oxygen Sensor Upstream Downstream for Mitsubishi Outlander Sport (2015-2018) 2.4L

Direct-Fit O2 Sensor Kit for 2015-2018 Mitsubishi Outlander Sport (GA5W)

What it Does: This matched upstream and downstream oxygen sensor kit monitors pre- and post-catalyst exhaust oxygen on the 2015-2018 Mitsubishi Outlander Sport GA5W (4B12 2.4L MIVEC) to regulate fuel trim and verify catalyst efficiency.

The Stock Mitsubishi Outlander Sport O2 Sensor Failure

Factory oxygen sensors on the GA5W chassis with the 4B12 2.4L MIVEC engine suffer thermal cycling fatigue, moisture shock, and carbon fouling over time. As the zirconia sensing element degrades or the internal heater circuit opens, voltage response slows and triggers P0134, P0135, or P0141 codes. Sluggish upstream feedback skews closed-loop fueling, while degraded downstream monitoring falsely flags P0420 catalyst efficiency faults.

Common Symptoms of a Failing OEM Oxygen Sensor

• Check Engine Light / DTCs: Triggers P0134, P0135, P0141, or P0420 fault codes.
• Fuel Trim Instability: Slow millivolt switching causes rough idle and poor fuel economy.
• Emissions Failure: Incomplete readiness monitors fail OBD-II smog inspections.

The Direct-Fit Dual Oxygen Sensor Solution

This matched pair replaces OEM numbers 1588A228, 1588A144, 234-5051, and 234-4114 with direct-fit upstream and downstream sensors for the 4B12 2.4L MIVEC exhaust manifold and mid-pipe bungs. High-temperature stainless housings, dual-layer shields, and zirconia ceramic elements resist thermal shock and exhaust contamination. Factory-matched connectors and exact harness lengths restore rapid closed-loop ECU communication without cutting or wiring adapters.

What's Included

• 1 Upstream Oxygen Sensor
• 1 Downstream Oxygen Sensor

Technical Specifications

Compatibility

• 2015-2018 Mitsubishi Outlander Sport 2.4L (2-sensor configuration)
• Excludes 2011-2012 2.0L applications (offered separately); confirm 2.4L engine before ordering

Frequently Asked Questions & Fitment Warnings

Does this fit the GA5W Outlander Sport?

Yes. This is a direct fit for the 2015-2018 Mitsubishi Outlander Sport equipped with the 4B12 2.4L MIVEC engine. Excludes 2011-2012 2.0L models, Lancer, Outlander, and RVR applications.

Will this clear P0135, P0141, or P0420 codes?

Yes, when caused by worn sensors. Replacing 1588A228 / 234-5051 and 1588A144 / 234-4114 restores heater resistance and switching speed.

Is wiring splicing or extra hardware required?

No. Both direct-fit sensors include OEM plug-and-play connectors and standard threads; torque to factory spec without contaminating the sensor tip.

The Mitsubishi Precision Standard

Built for accurate ECU feedback and emissions compliance, this matched sensor pair restores factory fuel trim control and CEL-free operation on your GA5W. Replacing both sensors together prevents asymmetric response lag.