How to Replace Oxygen Sensor
Learn how to replace oxygen sensor with our detailed step-by-step guide. Follow our easy instructions to get it done right.
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0 of 6 steps completedStep-by-Step Instructions
1 Step 1: Diagnose Faulty O2 Sensor
Step 1: Diagnose Faulty O2 Sensor
Check for P0420, P0430, or sensor-specific codes, poor fuel economy, or failed emissions test.
OBD2 Scanner
Code reader for identifying which O2 sensor is faulty
2 Step 2: Locate Failed Oxygen Sensor
Step 2: Locate Failed Oxygen Sensor
Identify sensor position (bank 1/2, upstream/downstream) based on code, find on exhaust pipe.
3 Step 3: Heat Sensor and Apply Penetrating Oil
Step 3: Heat Sensor and Apply Penetrating Oil
Run engine to warm exhaust, spray sensor threads with penetrant, wait 15 minutes.
Penetrating Oil Spray
PB Blaster for loosening seized O2 sensors
4 Step 4: Disconnect Electrical Connector
Step 4: Disconnect Electrical Connector
Unplug sensor wiring harness connector, carefully pull apart without damaging terminals.
5 Step 5: Remove Old Sensor
Step 5: Remove Old Sensor
Use O2 sensor socket to unscrew sensor counterclockwise, may require significant force if seized.
Oxygen Sensor Socket
Special deep socket with wire clearance slot
Breaker Bar
Long handle for extra leverage on stuck sensors
6 Step 6: Install New Sensor
Step 6: Install New Sensor
Apply anti-seize to threads (avoid sensor tip), hand-thread new sensor, tighten to spec, reconnect wiring.
Oxygen Sensor
Replacement O2 sensor for your vehicle position
Anti-Seize Compound
High-temp lubricant for O2 sensor threads