How to Replace Downstream O2 Sensor 05-10 Chrysler 300
Difficulty: Intermediate · About 40 min · Chrysler 300
Replace the downstream oxygen sensor on a 2005–2010 Chrysler 300 by supporting the vehicle, unplugging the sensor, and securing the replacement wiring away from the exhaust.
Tools you will need
- Floor jack
- Jack stands
- 22mm wrench
- Hammer
Parts and supplies
- Downstream oxygen sensor
Steps
- Raise and support the vehicle
Park level and use approved lifting points to raise the vehicle. Support it on jack stands before working underneath, and make sure the vehicle is stable.
- Disconnect and remove the sensor
Release the oxygen sensor wiring plug and move its harness away from the exhaust. Use a 22mm wrench to loosen the sensor; apply controlled force only, avoiding damage to the pipe or nearby wiring.
- Install the replacement sensor
Remove the shipping protector and thread the new sensor into the bung by hand. Tighten it to the vehicle's specification, reconnect the harness, and ensure its lead is routed away from hot exhaust parts.
- Lower vehicle and verify repair
Lower the vehicle after confirming the sensor connector is locked and the wire is secured. Clear diagnostic codes only with the appropriate scan tool and check for warning lights after restart.
Check your vehicle’s repair manual for exact specifications and fit.