Optima V6-2.7L VIN 8 (2006)
5. While repeatedly racing the engine, measure the oxygen sensor output voltage.
6. If there is a problem, there may be an oxygen sensor malfunction.
Tightening torque
Heated oxygen sensor : 35 - 45 Nm (350 - 450 kg.cm, 28.1 - 33.1 lb.ft)
Harness Inspection Procedures