Toyota Supra RX300 Highlander Downstream Oxygen Sensor 89465-19595

Key Features

• Replaces OE# 89465-19595, 89465-19695, 89465-49075
• Downstream / rear / post-catalytic converter sensor
• Heated 4-wire oxygen sensor design
• Improves fuel efficiency and emissions monitoring
• Durable construction for long-term reliability
• Direct-fit plug-and-play installation
• Approximate harness length: 19.69 inches
• Backed by a 2-year warranty

【Warranty】2 Years. (Beef up fuel efficiency & Stable performance & Durable)
【Placement on Vehicle】▲Downstream, Rear, Post-cat ▲Sensor Type : Heated ▲Wire Count : 4-Wire ▲Wire Harness Length:19.69 In.

Vehicle Compatibility

Toyota

• Toyota Highlander → 2001–2003 (3.0L V6)
• Toyota Supra →
  • 1993–1998 Twin Turbo 3.0L I6
  • 1993–1997 Base 3.0L I6

• Lexus

  • Lexus RX300 → 1999–2003 (3.0L V6)

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  Sensor Specifications

  • Placement: Downstream / Rear / Post-Cat
  • Sensor Type: Heated O2 Sensor
  • Wire Configuration: 4-Wire

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【Interchange Part Number】234-4215, 2344215, 234 4215, 89465-19595, 89465 19595, 8946519595, 89465-19695, 89465 19695, 8946519695, 89465-49075, 89465 49075, 8946549075

Why the Downstream O2 Sensor Matters

The downstream sensor monitors:

• Catalytic converter efficiency
• Exhaust oxygen levels
• Emissions system performance

When it fails, you may experience:

• Poor fuel economy
• Check engine lights
• Failed emissions tests
• Incorrect fuel trims

And yes, your car can still “run fine” while quietly wasting fuel.

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Performance Benefits

Replacing your O2 sensor restores:

• Proper emissions monitoring
• Improved fuel efficiency
• Stable ECU operation
• Better long-term drivability
• Correct catalytic converter feedback

Basically, your ECU stops guessing.

234-4215 Downstream O2 Sensor Toyota Supra Highlander Lexus RX300 Replacement

Perfect for High-Mileage Toyotas

Especially important on:

• Older 2JZ-powered Supras
• Early RX300s
• First-gen Highlanders

Because sensors from the 90s are probably tired by now.

Installation Notes

• Direct-fit replacement
• Threads into factory exhaust bung
• O2 sensor socket recommended

Simple install. Big difference in drivability and efficiency.

Final Take

No horsepower gains.

But your Toyota or Lexus runs cleaner, smoother, and more efficiently again—and that’s exactly what a good O2 sensor should do.