13. FUEL INJECTION SYSTEM People GT 300i O2 SENSOR The O2 sensor issues signal to ECU when the temperature is over 350°C during the engine is working. The temperature is up to 350°C earlier than the muffler for O2 heater sensor. So the O2 sensor begins performance. The function of O2 sensor only controls the fuel injector operation. INSPECTION Disconnect the O2 sensor connector. Measure the resistance between each White wire terminals of the O2 sensor side connector. Standard: 7.71.2 (at 20°C/68°F) REMOVAL/INSTALLATION Disconnect the O2 sensor connector and then remove it from exhaust muffler. Installation is in the reverse order of removal. Apply anti-seize compound on the surface of thread area before O2 sensor installation. Tighten the O2 sensor to specified torque. Torque: 2.5 kgf-m (25 N-m, 18 lbf-ft) 13-22