Oxygen Sensor Lambda O2 234-4642 Heated Piezoelectric for Mitsubishi Lancer Diamante Eclipse

Keep your Mitsubishi running smoothly with the Mitsubishi Lancer Diamante Eclipse Oxygen Sensor Lambda O2 234-4642. This high-quality, heated piezoelectric sensor is engineered to monitor exhaust oxygen levels and feed precise data to your engine control unit. By maintaining the correct air-fuel ratio, it helps maximize fuel efficiency, reduce emissions, and smooth out idle while preserving engine performance across a range of models, including Lancer, Diamante, and Eclipse variants.

Designed for fast response, the heated O2 sensor reaches operating temperature quickly, enabling accurate readings even after a cold start. This minimizes unnecessary rich or lean conditions that can trigger check-engine lights and catalytic converter strain. With compatibility across multiple Mitsubishi configurations, you can replace worn sensors with confidence using a single part number that covers upstream and downstream applications for 2.0L, 2.4L, 3.0L, and 3.5L engines.

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Benefits & Tips

• Replace a failing O2 sensor to restore precise air-fuel control, improve throttle response, and help your catalytic converter operate efficiently.
• Benefit from fast sensor startup thanks to the built-in heating element, reducing cold-start roughness and emissions during highway or city driving.
• Verify fitment and location (upstream vs downstream) for your specific Mitsubishi model (Lancer, Diamante, Eclipse) and ensure compatibility with California emission constraints where noted.

Product Specifications

• Brand: IWOKPHD
• Part Numbers: MD170618, MD177968, MD180618, MD319787, MD357266, MN158773, MR507854, MR578532
• OEM No.: 234-4642
• Sensor Type: Piezoelectric
• Heating Type: Heating
• Measuring Range: 1992–2006 (covers 1992, 1993, 1997–1998, 2000–2006 model years)
• Origin: Mainland China
• Compatibility / Fitment:
  • Mitsubishi Lancer 2.0L L4 SOHC 2002–2006 Downstream
  • Mitsubishi Lancer 2.0L L4 Turbo 2003 Downstream
  • Mitsubishi Diamante 3.0L V6 DOHC 1992–1993 Upstream
  • Mitsubishi Diamante 3.0L V6 SOHC 1992–1993 Upstream
  • Mitsubishi Diamante 3.5L V6 1997–1998 Downstream
  • Mitsubishi Diamante 3.5L V6 1999–2000 Downstream (Exc. Calif)
  • Mitsubishi Eclipse 2.4L L4 2000 Downstream (Exc. Calif)
  • Mitsubishi Eclipse 3.0L V6 2000 Upstream (Exc. Calif)

Package includes:

• 1x Oxygen Sensor

Warnings / Reminders

• Before purchasing, please double-check part numbers, accessories, and vehicle fitment to ensure compatibility.
• If you’re unsure about fitment, provide a photo of the current sensor or the part number to confirm compatibility before ordering.
• Verify upstream vs downstream location for your specific vehicle and note that some models are listed as Excludes California (Exc. Calif) emission configurations.
• Items typically ship within 2 working days after payment; warranty is a replacement warranty for malfunctioning items on receipt.