Subaru Subaru WRX 2002-2007 Fuel System Specifications

The 2002-2007 Subaru WRX requires premium unleaded gasoline with an octane rating of 91 or higher. Using lower-octane fuel can lead to engine knocking, reduced performance, and potential long-term damage. The turbocharged engine is designed to optimize performance with higher-octane fuel, ensuring efficient combustion and power output.

The 2002-2007 Subaru WRX requires regular maintenance to ensure optimal performance. Key intervals include oil changes every 3,000-5,000 miles, air filter replacement every 15,000 miles, and spark plug replacement every 60,000 miles. Additionally, inspect the timing belt every 105,000 miles and replace it if necessary. Regular checks of fluid levels, brakes, and tires are also essential.

To replace the fuel filter on a 2002-2007 Subaru WRX, first, relieve fuel system pressure by disconnecting the fuel pump fuse and running the engine until it stalls. Locate the fuel filter near the rear passenger side wheel. Disconnect the fuel lines and mounting bracket, then remove the old filter. Install the new filter, reconnect the lines, and secure the bracket. Finally, reconnect the fuel pump fuse and start the engine to check for leaks.

Poor fuel economy in the 2002-2007 Subaru WRX can result from several issues. Check for clogged air filters, faulty oxygen sensors, or dirty fuel injectors. Ensure proper tire pressure and alignment, as these can impact efficiency. Additionally, inspect the fuel system for leaks or blockages. If the problem persists, consider having the engine control unit (ECU) scanned for error codes.

To optimize performance, use premium fuel and consider upgrading to a high-flow air filter and exhaust system. Regularly maintain the turbocharger and intercooler to ensure efficient operation. Tuning the ECU with a performance chip or aftermarket software can also enhance power and throttle response. Additionally, ensure proper tire grip and suspension alignment for better handling.