my Honda Civic 10th Generation (2016-2021) has a P0138 code what does this mean

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the negative battery terminal to prevent electrical shorts.
• Allow the engine to cool down before beginning work.

2. Inspect and Replace Oxygen Sensor

1. Locate the Oxygen Sensor:

   • Find the upstream oxygen sensor (usually located in the exhaust manifold).

2. Remove the Oxygen Sensor:

   • Use an oxygen sensor socket or wrench to carefully unscrew the sensor from the exhaust system.
   • Be cautious of hot surfaces if the engine was recently running.

3. Inspect the Sensor and Wiring:

   • Check the sensor for any signs of damage or wear.
   • Inspect the wiring harness connected to the sensor for fraying or corrosion.

4. Install the New Oxygen Sensor:

   • Apply anti-seize compound to the threads of the new oxygen sensor (if applicable).
   • Thread the new sensor into the exhaust system and tighten it to the manufacturer’s specifications (typically around 30 lb-ft).

5. Reconnect the Wiring:

   • Plug in the electrical connector to the new oxygen sensor ensuring a snug fit.

3. Clear Codes and Test Drive

1. Reconnect Battery Terminal:

   • Reattach the negative battery terminal and ensure it is secure.

2. Clear the Trouble Codes:

   • Use the OBD-II scanner to erase the P0138 code from the vehicle’s computer.

3. Test Drive the Vehicle:

   • Drive the vehicle for at least 20 minutes to allow the engine to reach operating temperature and monitor for any reoccurring codes.