how to fix P0135 oxygen sensor issue on Toyota Camry Eighth Generation (2018-present)

Toyota Camry Eighth Generation (2018-present)

Error Codes

1-2 hours

Time

medium

Difficulty

high

Severity

Error Code: P0135

3 min read

508 words

⚠️ Safety Warning

This issue requires immediate attention. If you are not experienced with automotive repairs, consult a professional mechanic. Working on critical systems can be dangerous.

Problem Statement

Learn how to diagnose and fix P0135 oxygen sensor issue in Toyota Camry (2018-present). Step-by-step guide with diagnostic procedures and repair instructions.

Error Code

P0135

Affected Component

Exhaust System

Estimated Time

1-2 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

•Disconnect battery before working on electrical systems.
•Allow the engine to cool completely before performing any repairs.

Symptoms

•Check engine light illuminated
•Poor fuel economy
•Rough engine idle
•Emissions test failure
•Increased engine noise

Diagnostic Steps

1
Scan the vehicle's onboard computer with an OBD-II scanner to confirm the P0135 code and check for additional trouble codes.
2
Inspect the oxygen sensor wiring and connectors visually for damage, corrosion, or disconnections.
3
Measure the voltage output of the upstream oxygen sensor using a multimeter to determine if it is within specifications.
4
Check the vehicle's fuse related to the oxygen sensor circuit to ensure it is not blown.
5
Test the vehicle's ground connections and power supply to the oxygen sensor for continuity.

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
•Multimeter
•Oxygen sensor socket
•Socket wrench set
•Wire brush

Parts Required

•New upstream oxygen sensor
•Anti-seize compound

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Diagnostic Steps

1
Scan the vehicle's onboard computer with an OBD-II scanner to confirm the P0135 code and check for additional trouble codes.
2
Inspect the oxygen sensor wiring and connectors visually for damage, corrosion, or disconnections.
3
Measure the voltage output of the upstream oxygen sensor using a multimeter to determine if it is within specifications.
4
Check the vehicle's fuse related to the oxygen sensor circuit to ensure it is not blown.
5
Test the vehicle's ground connections and power supply to the oxygen sensor for continuity.

Solution

1. Preparation

Gather all necessary tools and parts.
Ensure the vehicle is parked on a flat surface and the engine is off and cool.
Disconnect the battery to prevent electrical shock.

2. Remove the Faulty Oxygen Sensor

Locate the upstream oxygen sensor (usually found in the exhaust manifold or before the catalytic converter).
Use a socket wrench with the appropriate oxygen sensor socket to unscrew the sensor from its mounting point.
Carefully disconnect the wiring harness from the oxygen sensor.

3. Inspect and Clean

Check the threads of the oxygen sensor hole for carbon buildup or obstructions. Clean if necessary using a wire brush.
Verify the condition of the wiring harness and connectors for signs of wear or damage. Repair or replace as needed.

4. Install New Oxygen Sensor

Apply anti-seize compound to the threads of the new oxygen sensor (if applicable).
Screw the new oxygen sensor into the exhaust manifold, tightening it to the manufacturer's specified torque (usually around 30-40 ft-lbs).
Reconnect the wiring harness to the new oxygen sensor securely.

5. Reconnect Battery and Clear Codes

Reconnect the vehicle's battery.
Use the OBD-II scanner to clear the P0135 code from the vehicle's computer.