Tomei Stainless Steel O2 Sensor Bung and Plug (490001)

The use of an A/F sensor and gauge is an indispensable tool for engine tuning. To acquire the A/F reading, an O2 sensor needs to be installed on the exhaust manifold or the front pipe, along with installation of A/F gauge. This O2 sensor bung is then required in order to installing an O2 sensor on your's car. A bung plug bolt is also included for when the O2 sensor is removed.