How to Replace O2 Oxygen Sensor 03-09 Hyundai Elantra
Difficulty: Intermediate · About 3 min · Hyundai Elantra
Replace the oxygen sensor on a 2003–2009 Hyundai Elantra with the exhaust cold, restoring the heat shield and wiring clips so the lead stays clear of hot surfaces.
Tools you will need
- 12mm Socket
- Socket Extensions
- O2 Sensor Socket
- 10mm Socket
Parts and supplies
- Correct replacement oxygen sensor
Steps
Remove the engine cover and shield
Let the engine and exhaust cool completely. Remove the engine cover and heat-shield fasteners, then unclip and unplug the oxygen-sensor connector.
Remove the old sensor
Use an oxygen-sensor socket to loosen the sensor from the exhaust. Inspect the bung threads and keep dirt away from the opening.
Install the replacement sensor
Start the new sensor by hand and tighten it to the vehicle specification. Avoid contaminating its sensing tip and route the lead through the heat-shield opening.
Reconnect and inspect
Refit the heat shield and engine cover, reconnect the plug, and secure the wire in its clips. Start the engine and check for exhaust leaks.
Check your vehicle’s repair manual for exact specifications and fit.