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 MANUALSCHRYSLER2003300M V6-3.5L VIN MREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSOXYGEN SENSORSERVICE AND REPAIRUPSTREAM SENSOR
2003 Chrysler 300M V6-3.5L VIN M
Upstream Sensor
2003 Chrysler 300M V6-3.5L VIN MSECTION Upstream Sensor
REMOVAL - UPSTREAM 1/1 or 2/1
The engines uses two heated oxygen sensors, one in each exhaust manifold.
CAUTION: When disconnecting the sensor electrical connector, do not pull directly on wire going into sensor.
1. Remove the negative battery cable.
2. Disconnect the heated oxygen sensor electrical connector.
3. Use a socket such as Snap-On YA8875 or a crow foot wrench to remove oxygen sensor.
INSTALLATION - UPSTREAM 1/1 or 2/1
The engines uses two heated oxygen sensors, one in each exhaust manifold.
1. After removing the sensor, the exhaust manifold threads must be cleaned with an 18 mm x 1.5 + 6E tap. If reusing the original sensor, coat the sensor threads with an anti-seize compound such as Loctite 771- 64 or equivalent. New sensors have compound on the threads and do not require an additional coating. Tighten the sensor to 28 N.m (20 ft.lbs.) torque.
2. Connect the heated oxygen sensor electrical connector.
3. Install the negative battery cable.
The engines uses two heated oxygen sensors, one in each exhaust manifold.
CAUTION: When disconnecting the sensor electrical connector, do not pull directly on wire going into sensor.
1. Remove the negative battery cable.
2. Disconnect the heated oxygen sensor electrical connector.
Fig.21 Upstream Heated Oxygen Sensor 1/1:
3. Use a socket such as Snap-On YA8875 or a crow foot wrench to remove oxygen sensor.
INSTALLATION - UPSTREAM 1/1 or 2/1
The engines uses two heated oxygen sensors, one in each exhaust manifold.
1. After removing the sensor, the exhaust manifold threads must be cleaned with an 18 mm x 1.5 + 6E tap. If reusing the original sensor, coat the sensor threads with an anti-seize compound such as Loctite 771- 64 or equivalent. New sensors have compound on the threads and do not require an additional coating. Tighten the sensor to 28 N.m (20 ft.lbs.) torque.
2. Connect the heated oxygen sensor electrical connector.
3. Install the negative battery cable.
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.