how to fix the P0138 code on my Toyota Corolla E170 (2013-2019)

• •Check engine light illuminated
• •Poor fuel economy
• •Rough engine idle
• •Increased emissions
• •Failed emissions test

1. 1Scan for error codes using an OBD-II scanner to confirm P0138 and check for any additional codes.
2. 2Inspect the wiring harness and connectors leading to the bank 1 sensor 2 for damage, corrosion, or loose connections.
3. 3Use a multimeter to measure the voltage output of the O2 sensor while the engine is running; it should fluctuate between 0.1V and 0.9V.
4. 4Check the engine coolant temperature sensor reading to ensure it is functioning properly; a faulty sensor can affect O2 sensor readings.
5. 5Inspect the exhaust system for leaks, as they can introduce excess oxygen and affect O2 sensor performance.
6. 6Test the O2 sensor's ground connection to ensure it has a proper ground.

After completing the repair, verify that the issue has been resolved:

• ✓Test the affected component to ensure it functions correctly
• ✓Check for any error codes or warning lights
• ✓Monitor the vehicle for a few days to ensure the issue does not recur

To prevent this issue from occurring again:

• •Follow the manufacturer's recommended maintenance schedule
• •Address warning signs early before they develop into major issues
• •Use quality parts and fluids recommended for your vehicle
• •Keep detailed records of all repairs and maintenance

• •OBD-II scanner
• •Socket set (22mm O2 sensor socket)
• •Multimeter
• •Wire brush
• •Electrical contact cleaner

• •New O2 sensor (bank 1 sensor 2)