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 MANUALSMITSUBISHI2004GALANT V6-3.8L (6G75)REPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSOXYGEN SENSORSERVICE AND REPAIR
2004 Mitsubishi Galant V6-3.8L (6G75)
Oxygen Sensor: Service and Repair
2004 Mitsubishi Galant V6-3.8L (6G75)SECTION Service and Repair
EXHAUST MANIFOLD
REMOVAL AND INSTALLATION
Required Special Tools:
- MB991953: Oxygen sensor wrench
- MD998770: Oxygen sensor wrench
REMOVAL SERVICE POINTS
<> LEFT BANK HEATED OXYGEN SENSOR. (FRONT)/RIGHT BANK HEATED OXYGEN SENSOR (FRONT)/RIGHT BANK HEATED OXYGEN SENSOR (REAR) REMOVAL
Use special tool MD998770 to remove the heated oxygen sensor.
<> LEFT BANK HEATED OXYGEN SENSOR (REAR) REMOVAL
Use special tool MB991953 to remove the heated oxygen sensor.
INSTALLATION SERVICE POINTS
>>A<< RIGHT BANK HEATED OXYGEN SENSOR (REAR)/RIGHT BANK HEATED OXYGEN SENSOR (FRONT)/LEFT BANK HEATED OXYGEN SENSOR (FRONT) INSTALLATION
Use special tool MD998770 to install the heated oxygen sensor.
>>B<< LEFT BANK HEATED OXYGEN SENSOR (REAR) INSTALLATION
Use special tool MB991953 to install the heated oxygen sensor.
INSPECTION
Check the following points; replace the part if a problem is found.
Exhaust Manifold Check
1. Check for damage or cracking of any part.
2. Using a straight edge and a feeler gauge, check for distortion of the cylinder head installation surface.
Standard value: 0.15 mm (0.006 inch) or less
Limit: 0.20 mm (0.008 inch)
REMOVAL AND INSTALLATION
Required Special Tools:
- MB991953: Oxygen sensor wrench
- MD998770: Oxygen sensor wrench
REMOVAL SERVICE POINTS
<> LEFT BANK HEATED OXYGEN SENSOR. (FRONT)/RIGHT BANK HEATED OXYGEN SENSOR (FRONT)/RIGHT BANK HEATED OXYGEN SENSOR (REAR) REMOVAL
Use special tool MD998770 to remove the heated oxygen sensor.
<> LEFT BANK HEATED OXYGEN SENSOR (REAR) REMOVAL
Use special tool MB991953 to remove the heated oxygen sensor.
INSTALLATION SERVICE POINTS
>>A<< RIGHT BANK HEATED OXYGEN SENSOR (REAR)/RIGHT BANK HEATED OXYGEN SENSOR (FRONT)/LEFT BANK HEATED OXYGEN SENSOR (FRONT) INSTALLATION
Use special tool MD998770 to install the heated oxygen sensor.
>>B<< LEFT BANK HEATED OXYGEN SENSOR (REAR) INSTALLATION
Use special tool MB991953 to install the heated oxygen sensor.
INSPECTION
Check the following points; replace the part if a problem is found.
Exhaust Manifold Check
1. Check for damage or cracking of any part.
2. Using a straight edge and a feeler gauge, check for distortion of the cylinder head installation surface.
Standard value: 0.15 mm (0.006 inch) or less
Limit: 0.20 mm (0.008 inch)
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.