Toyota 4Runner and Tacoma owners, if you're dealing with check engine lights or poor fuel economy, this Herko air/fuel ratio sensor might be exactly what you need! Specifically designed as a direct replacement for 1999-2003 Toyota models, the OX799 sensor meets or exceeds OEM specifications so you know you're getting quality that matches the original part. Each sensor is 100% tested during manufacturing to ensure it works right out of the box - no guessing whether you got a defective unit. The construction uses high-quality materials built to handle engine heat and vibration for reliable long-term performance. Installation is straightforward if you're handy, or any mechanic can swap it out quickly. Before ordering, definitely double-check your year, make, and model to ensure compatibility - this sensor is specifically for 1999-2003 Toyota 4Runners and Tacomas. The best part? It comes with a 1-year replacement warranty for complete peace of mind. If your Toyota is showing O2 sensor codes or running rough, this affordable replacement can restore performance and fuel efficiency without the dealership price tag. Much better than trying to clean an old sensor that's past its prime!