2015-2022 2nd Gen 2018 Chevy Colorado GMC Canyon O2 Oxygen Sensor Replacement Upstream & Downstream

Introduction

This tutorial provides a comprehensive guide on replacing the oxygen sensors in a 2015-2022 Chevy Colorado or GMC Canyon equipped with a 3.6L V6 engine. The process involves removing both upstream and downstream oxygen sensors, which is essential for maintaining optimal engine performance and emissions control. Follow these steps for a successful replacement.

Step 1: Gather Necessary Tools and Parts

Before starting, ensure you have the following tools and parts ready:

• New oxygen sensors (same part number for all four; NTK or Bosch recommended)
• Oxygen sensor wrench
• 3/8 inch ratchet and half-inch ratchet
• Multiple extensions for reach
• 10mm open-end wrench (ratcheting preferred)
• Flathead screwdrivers (small and medium sizes)
• Torque wrench
• Anti-seize compound (if not pre-applied)
• Safety gloves and eye protection

Step 2: Prepare the Vehicle

1. Disconnect the Battery:

   • Remove the negative terminal from the battery to prevent electrical shorts during the replacement process.

2. Remove the Engine Cover (if applicable):

   • Use a 10mm wrench to remove any bolts holding the cover in place for better access to the sensors.

Step 3: Remove Upstream Oxygen Sensors

1. Locate the Sensors:

   • The upstream sensors are located before the catalytic converter. There are two sensors: Bank 1 (passenger side) and Bank 2 (driver's side).

2. Remove the Sensor:

   • Attach the oxygen sensor wrench over the sensor, ensuring the wire slot is aligned.
   • Use the ratchet with extensions to turn the wrench. If stuck, apply leverage using a breaker bar.
   • Once loose, remove the sensor by twisting it out.

3. Disconnect the Wiring Harness:

   • Locate the clip securing the wiring harness. Press the release tab to disconnect the sensor's connector.

4. Install the New Sensor:

   • Remove the protective cap from the new sensor.
   • Apply a small amount of anti-seize to the threads if not already applied.
   • Screw the new sensor in clockwise until snug, then torque to specifications (31 ft-lbs recommended).

5. Reconnect the Wiring:

   • Push the wiring harness connector back into place until it clicks.

Step 4: Repeat for Downstream Oxygen Sensors

1. Locate the Downstream Sensors:

   • Follow the exhaust pipe to find the sensors after the catalytic converter.

2. Follow the same removal and installation process:

   • Use the oxygen sensor wrench to remove the old sensors.
   • Disconnect the wiring, install the new sensors, and reconnect the wiring.

Step 5: Reassemble and Test

1. Reconnect the Battery:

   • Secure the negative battery terminal back in place.

2. Start the Vehicle:

   • Start the engine and check for any warning lights on the dashboard.
   • Listen for unusual sounds and ensure the vehicle runs smoothly.

Conclusion

Replacing the oxygen sensors in your Chevy Colorado or GMC Canyon can enhance engine performance and reduce emissions. By following these steps, you can successfully complete the task with basic tools and knowledge. Remember to regularly check your vehicle's performance and address any warning lights that may appear after the replacement.