how to fix P0135 oxygen sensor code in Ram 1500 DT (2019-Present)

Learn how to diagnose and fix P0135 oxygen sensor code in Ram 1500 DT. Step-by-step guide with diagnostic procedures and repair instructions.

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the vehicle's battery (negative terminal).
• Ensure the vehicle is parked on a level surface and engage the parking brake.

2. Inspect and Repair Wiring

• Sub-steps:
  • Remove the plastic cover or insulation around the wiring harness leading to the oxygen sensor.
  • Visually inspect for any frayed wires, corrosion, or damaged connectors.
  • Repair or replace any damaged wiring or connectors as necessary.
• Tools Required: Wire cutters, soldering iron, heat shrink tubing, electrical tape.

3. Replace the Oxygen Sensor

• Sub-steps:
  • Locate the upstream oxygen sensor (usually before the catalytic converter).
  • Use an oxygen sensor socket or wrench to unscrew the old sensor from the exhaust manifold.
  • Apply anti-seize compound to the threads of the new sensor.
  • Install the new oxygen sensor and torque it to the manufacturer's specifications (typically around 30 lb-ft).
  • Reconnect the electrical connector to the oxygen sensor.
• Tools Required: Oxygen sensor socket, torque wrench, anti-seize compound.

4. Reconnect Battery and Clear Codes

• Sub-steps:
  • Reconnect the negative terminal of the battery.
  • Use the OBD-II scanner to clear the P0135 code from the vehicle's computer.
  • Start the engine and allow it to reach operating temperature while monitoring the engine performance.
• Tools Required: OBD-II scanner.