how to resolve the P0138 code in my Toyota Corolla E140 (2006-2013)

• •Check engine light illuminated
• •Poor fuel economy
• •Rough idle or stalling
• •Increased emissions
• •Possible decrease in engine performance

1. 1Scan the vehicle's OBD-II system to confirm the P0138 code and check for any additional codes.
2. 2Visually inspect the wiring and connectors related to the downstream oxygen sensor for damage or corrosion.
3. 3Measure the voltage output of Bank 1 Sensor 2 using a multimeter to determine if it is consistently high (above 0.9V).
4. 4Check the exhaust system for leaks that could affect sensor readings.
5. 5Verify the proper operation of Bank 1 Sensor 1 (upstream oxygen sensor) to rule out upstream sensor issues affecting downstream readings.

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
• •Multimeter
• •Socket set
• •Torque wrench
• •Vehicle lift or jack stands

• •New oxygen sensor (Bank 1 Sensor 2)