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 MANUALSMITSUBISHI2009LANCER L4-2.4L (4B12)REPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTEMISSION CONTROL SYSTEMSCATALYTIC CONVERTERSERVICE AND REPAIR
2009 Mitsubishi Lancer L4-2.4L (4B12)
Catalytic Converter: Service and Repair
2009 Mitsubishi Lancer L4-2.4L (4B12)SECTION Service and Repair
CATALYTIC CONVERTER
REMOVAL AND INSTALLATION [2.0L ENGINE NON-TURBO, 2.4L ENGINE]
- The catalytic converter is integrated with the center exhaust pipe. The removal and installation is the same as the center exhaust pipe.
- The catalytic converter is integrated with the front exhaust pipe and center exhaust pipe. The removal and installation is the same as the front exhaust pipe and center exhaust pipe.
REMOVAL SERVICE POINT
[[A]] HEATED OXYGEN SENSOR (REAR) REMOVAL
Use special tool MB991953 to remove the heated oxygen sensor (rear).
INSTALLATION SERVICE POINT
]]A[[ HEATED OXYGEN SENSOR (REAR) INSTALLATION
Tighten the heated oxygen sensor (rear) to the specified torque by using special tool MB991953.
Tightening torque: 44 ± 5 N.m (33 ± 3 ft-lb)
REMOVAL AND INSTALLATION [2.0L ENGINE NON-TURBO, 2.4L ENGINE]
- The catalytic converter is integrated with the center exhaust pipe. The removal and installation is the same as the center exhaust pipe.
- The catalytic converter is integrated with the front exhaust pipe and center exhaust pipe. The removal and installation is the same as the front exhaust pipe and center exhaust pipe.
REMOVAL SERVICE POINT
[[A]] HEATED OXYGEN SENSOR (REAR) REMOVAL
Use special tool MB991953 to remove the heated oxygen sensor (rear).
INSTALLATION SERVICE POINT
]]A[[ HEATED OXYGEN SENSOR (REAR) INSTALLATION
Tighten the heated oxygen sensor (rear) to the specified torque by using special tool MB991953.
Tightening torque: 44 ± 5 N.m (33 ± 3 ft-lb)
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.