why does my RAV4 XA40 (2013-2018) exhaust smell like rotten eggs

Solution

1. Preparation

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

2. Inspect and Test the Catalytic Converter

• Tools Required: Jack and jack stands, wrench set, exhaust gas analyzer (if available).
• Remove the heat shield (if applicable) to gain access to the catalytic converter.
• Visually inspect the catalytic converter for damage or signs of clogging (e.g., dents, discoloration).
• Use an exhaust gas analyzer to check for excessive emissions, confirming catalytic converter failure.
• Replace the catalytic converter if it is damaged or clogged.

3. Replace Faulty Oxygen Sensors

• Tools Required: O2 sensor socket, torque wrench, penetrating oil.
• Locate the upstream (pre-catalytic converter) and downstream (post-catalytic converter) oxygen sensors.
• Apply penetrating oil to the sensor threads and allow it to sit for a few minutes.
• Use the O2 sensor socket to remove the faulty sensors.
• Install new oxygen sensors, ensuring they are torqued to manufacturer specifications.

4. Check and Adjust Fuel Pressure

• Tools Required: Fuel pressure gauge, wrench set.
• Locate the fuel pressure test port on the fuel rail.
• Connect the fuel pressure gauge and turn the ignition to the "ON" position without starting the engine.
• Check the fuel pressure reading against Toyota specifications. If it’s too high or too low, inspect the fuel pump or pressure regulator for faults.
• Replace the faulty fuel pump or pressure regulator if necessary.

5. Final Assembly

• Reinstall any components removed during inspection and repair.
• Reconnect the battery and start the engine to check for any exhaust leaks or new symptoms.