how to fix P0420 code on Tesla Model Y Current (2020-present)

Solution

1. Preparation

• Gather tools and parts required for the repair.
• Disconnect the negative battery terminal to ensure safety during the repair process.

Tools Required:

• OBD-II scanner
• Socket set
• Torque wrench
• Exhaust pipe cutter (if necessary)
• Multimeter

2. Inspect and Replace Oxygen Sensors

• Sub-step 1: Remove the negative battery terminal.
• Sub-step 2: Locate the upstream and downstream oxygen sensors in the exhaust system.
• Sub-step 3: Use a socket wrench to carefully unscrew the oxygen sensors.
• Sub-step 4: Inspect the sensors for damage or contamination; replace if necessary.
• Sub-step 5: Install new oxygen sensors and torque them to manufacturer specifications (usually around 30 lb-ft).

3. Inspect and Replace the Catalytic Converter

• Sub-step 1: Recheck the exhaust for any leaks or blockages.
• Sub-step 2: If the catalytic converter is damaged or clogged, disconnect the exhaust pipes using a socket set.
• Sub-step 3: Cut the old catalytic converter out using an exhaust pipe cutter if necessary.
• Sub-step 4: Install the new catalytic converter, ensuring all connections are tight and leak-free.
• Sub-step 5: Torque all bolts to manufacturer specifications.

4. Reset the Engine Control Module (ECM)

• Sub-step 1: Reconnect the negative battery terminal.
• Sub-step 2: Use an OBD-II scanner to clear the P0420 code from the ECM.
• Sub-step 3: Start the engine and allow it to reach operating temperature.