how to fix P0135 code in Tesla Model S Plaid/Refresh (2021-present)

Learn how to diagnose and fix P0135 oxygen sensor heater issues in Tesla Model S Plaid. Step-by-step guide with diagnostic procedures and repair instructions.

Solution

1. Preparation

• Tools Required: OBD-II scanner, multimeter, socket set, torque wrench, wiring diagram for reference.
• Ensure the vehicle is parked on a level surface and the ignition is off.
• Disconnect the negative terminal of the battery for safety.

2. Inspect Wiring and Connectors

• Locate the upstream oxygen sensor (usually near the exhaust manifold).
• Visually inspect the wiring harness and connectors for any signs of wear, damage, or corrosion.
• If any damage is found, repair or replace the wiring and connectors as necessary.

3. Test Oxygen Sensor Heater Circuit

• Reconnect the battery and turn the ignition to the 'ON' position without starting the engine.
• Using a multimeter, check for voltage at the oxygen sensor heater terminal (should be around 12V).
• If there is no voltage, trace back to the fuse and check for continuity from the fuse to the sensor.

4. Replace the Oxygen Sensor (if necessary)

• If the oxygen sensor heater element is out of specification, remove the oxygen sensor using a socket set.
• Install the new oxygen sensor, ensuring it is properly torqued to the manufacturer's specifications (typically around 30-40 ft-lbs).
• Reconnect the electrical connector securely.

5. Clear Codes and Test Drive

• Use the OBD-II scanner to clear the P0135 code from the system.
• Perform a test drive to allow the vehicle's systems to recalibrate and monitor for any reoccurrence of the code.