Safety Warning

DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.

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HOMESERVICE MANUALSTOYOTA2004MATRIX XR, FWD, STANDARDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 750 (EMISSION CONTROL SYSTEM)HEATED OXYGEN SENSOR (3MZ-FE)REPLACEMENT

2004 Toyota Matrix XR, FWD, Standard

Heated Oxygen Sensor (3MZ-FE): Replacement

2004 Toyota Matrix XR, FWD, StandardSECTION Replacement

WARNING: This page is about a different car, the 2004 Lexus ES 330. However, it is still accessible from the selected car via links, so may be relevant.

DISCONNECT ENGINE WIRE NO. 3 (BATTERY NEGATIVE TERMINAL)
REMOVE HEATED OXYGEN SENSOR
1. Disconnect the 2 heated oxygen sensor connectors.
  
  Fig 1: Disconnecting 2 Heated Oxygen Sensor Connectors
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Using SST, remove the 2 heated oxygen sensors.
  SST 09224-00010
  
  Fig 2: Using SST, Removing 2 Heated Oxygen Sensors
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
INSTALL HEATED OXYGEN SENSOR
1. Using SST, remove the 2 heated oxygen sensors.
  SST 09224-00010
  
  Fig 3: Installing Heated Oxygen Sensor
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  Torque: 44 N.m (449 kgf.cm, 32 ft.lbf)
2. Connect the 2 heated oxygen sensor connectors.
DISCONNECT ENGINE WIRE NO. 3 (BATTERY NEGATIVE TERMINAL)
Torque: 5.4 N.m (55 kgf.cm, 48 in.lbf)
CHECK FOR EXHAUST GAS LEAKS
SYSTEM INITIALIZATION (See PRECAUTION )

RENDER: 1.0x

NO RELATED

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

• You smell fuel, burning insulation, or see smoke.
• Brakes feel soft, pull hard to one side, or make grinding noises.
• The engine overheats, stalls repeatedly, or misfires under load.
• You are missing required tools, torque specs, or safe lifting equipment.
• You are not confident in the next step or safety outcome.