what causes my Toyota Corolla E170 (2013-2019) to have a check engine light with code P0135

Toyota Corolla E170 (2013-2019)

Error Codes

1-2 hours

Time

medium

Difficulty

medium

Severity

Error Code: P0135

3 min read

484 words

Problem Statement

Learn how to diagnose and fix P0135 oxygen sensor circuit issue in Toyota Corolla E170. 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 the battery before working on electrical systems to prevent shocks or shorts.
•Allow the engine to cool before handling any hot components.

Symptoms

•Check engine light illuminated
•Poor fuel economy
•Engine stalling or rough idle
•Increased emissions
•Decreased engine performance

Diagnostic Steps

1
Scan the vehicle with an OBD-II scanner to confirm the P0135 code and check for any additional codes.
2
Inspect the wiring and connectors of the upstream oxygen sensor for damage, corrosion, or loose connections.
3
Measure the voltage output of the oxygen sensor using a multimeter while the engine is running.
4
Check the engine coolant temperature sensor to ensure it is functioning correctly, as it can affect oxygen sensor operation.
5
Inspect and test the vehicle's engine control module (ECM) for faults that may affect communication with the oxygen sensor.

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
•Oxygen sensor socket
•Ratchet
•Torque wrench
•Multimeter
•Wire brush
•Safety glasses

Parts Required

•New upstream oxygen sensor

Related Faults

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Diagnostic Steps

1
Scan the vehicle with an OBD-II scanner to confirm the P0135 code and check for any additional codes.
2
Inspect the wiring and connectors of the upstream oxygen sensor for damage, corrosion, or loose connections.
3
Measure the voltage output of the oxygen sensor using a multimeter while the engine is running.
4
Check the engine coolant temperature sensor to ensure it is functioning correctly, as it can affect oxygen sensor operation.
5
Inspect and test the vehicle's engine control module (ECM) for faults that may affect communication with the oxygen sensor.

Solution

1. Preparation

Gather tools and components needed for the repair.
Ensure the vehicle is parked on a flat surface and the engine is cool.
Disconnect the battery to prevent electrical shorts.

2. Inspect and Replace the Oxygen Sensor

Tools Required: Oxygen sensor socket, ratchet, torque wrench, multimeter, wire brush, safety glasses.
Locate the upstream oxygen sensor (typically on the exhaust manifold).
Use the oxygen sensor socket to carefully remove the oxygen sensor from the exhaust system.
Inspect the old sensor for signs of damage or contamination.
Clean the threads of the sensor mount using a wire brush to ensure proper sealing.
Install the new oxygen sensor, ensuring it is tightened to the manufacturer’s specified torque (usually around 30 ft-lbs).
Reconnect the electrical connector to the new oxygen sensor.

3. Clear the Check Engine Light

Reconnect the battery.
Use the OBD-II scanner to clear the P0135 code and any other codes stored in the ECM.