my Toyota Corolla E140 (2006-2013) exhaust smells like rotten eggs what could it mean

Solution

1. Preparation

• Gather necessary tools and parts.
• Ensure the vehicle is parked on a level surface and the engine is cool.
• Disconnect the battery to prevent electrical shocks.

2. Inspect and Replace Oxygen Sensors

1. Locate the upstream and downstream oxygen sensors on the exhaust system.
2. Disconnect the electrical connectors from the oxygen sensors.
3. Use a socket wrench to unscrew the sensors from the exhaust piping.
4. Install new oxygen sensors by threading them into the exhaust system and tightening to the manufacturer's torque specifications (usually around 30-40 ft-lbs).
5. Reconnect the electrical connectors.

3. Inspect and Replace Catalytic Converter (if necessary)

1. If the catalytic converter is damaged or clogged, remove the exhaust pipes connected to the converter.
2. Use a socket set to unbolt the catalytic converter from the exhaust manifold and exhaust pipe.
3. Install the new catalytic converter by reversing the removal steps, ensuring proper alignment and sealing with new gaskets.
4. Tighten the bolts to the manufacturer’s torque specifications.

4. Check and Adjust Fuel System

1. Test the fuel pressure using a fuel pressure gauge, comparing it to the manufacturer's specifications (typically 40-50 psi for a Corolla).
2. If the pressure is low, inspect the fuel filter and fuel pump for issues, replacing them if necessary.
3. Clean or replace the air filter to ensure optimal airflow to the engine.