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

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

Toyota Corolla E170 (2013-2019)

Error Codes
Severity: mediumDifficulty: mediumError Code: P01381-2 hours
3 min read
453 words

Problem Statement

Learn how to diagnose and fix P0138 high voltage issue in the oxygen sensor of Toyota Corolla E170 (2013-2019). Step-by-step guide included.

Error Code
P0138
Affected Component
Exhaust System
Estimated Time
1-2 hours

Safety Warnings

  • ⚠Disconnect the battery before working on electrical systems.
  • ⚠Allow the engine to cool before opening the exhaust system.

Symptoms

  • •Check engine light illuminated
  • •Decreased fuel efficiency
  • •Rough idle or stalling
  • •Failed emissions test
  • •Increased engine noise

Diagnostic Steps

  1. 1Scan for error codes using an OBD-II scanner to confirm P0138 and check for any additional codes.
  2. 2Inspect the wiring and connectors of the bank 1 sensor 2 oxygen sensor for damage or corrosion.
  3. 3Check the voltage and ground signals at the oxygen sensor connector using a multimeter.
  4. 4Inspect the exhaust system for leaks, particularly before the oxygen sensor.
  5. 5Test the functionality of the oxygen sensor by measuring the voltage output while the engine is running.

Solution

Solution

1. Preparation

  • Gather necessary tools and parts.
  • Disconnect the vehicle battery to prevent electrical shock or short circuits.
  • Allow the engine to cool before starting work.

2. Inspect and Replace Oxygen Sensor

  • Tools Required: O2 sensor socket, ratchet and extensions, multimeter, safety gloves, safety glasses.
  • Sub-steps:
    1. Locate the bank 1 sensor 2 oxygen sensor (usually located after the catalytic converter).
    2. Disconnect the electrical connector from the oxygen sensor.
    3. Using the O2 sensor socket, carefully unscrew the oxygen sensor from the exhaust pipe.
    4. Compare the old sensor with the new one to ensure compatibility.
    5. Apply anti-seize compound to the threads of the new oxygen sensor (if not pre-coated).
    6. Install the new oxygen sensor and tighten it to the manufacturer’s specified torque (usually around 30-40 lb-ft).
    7. Reconnect the electrical connector securely.

3. Clear Error Codes

  • Use the OBD-II scanner to clear the P0138 code from the vehicle's computer.
  • Reconnect the battery if it was disconnected.

Verification

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

Prevention Tips

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

Tools & Equipment Required

  • •OBD-II scanner
  • •O2 sensor socket
  • •Ratchet and extensions
  • •Multimeter
  • •Safety gloves
  • •Safety glasses

Parts Required

  • •New bank 1 sensor 2 oxygen sensor

Additional Information

Error Code
P0138
Affected Component
Exhaust System
Estimated Time
1-2 hours
Difficulty
medium
Severity
medium
Tools Required
6 items
Parts Required
1 item

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