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

Toyota Corolla E170 (2013-2019)

Error Codes

1-2 hours

Time

medium

Difficulty

medium

Severity

Error Code: P0138

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

Important safety information - read before proceeding

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

Solution

💡 Expert Tip

For complex repairs like this, consider taking photos at each step. This helps if you need to reverse a step or consult with a mechanic. Also, keep all removed parts organized - you may need to reference them during reassembly.

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

Related Faults

Share this solution

Comments

No comments yet

Be the first to share your thoughts

Back to Generation

Diagnostic Steps

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

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.