SLK 230 (170.449) L4-2.3L SC (111.983) (2001)
temperature upstream of TWC is limited to approx. 350 °C in the condensation phase after cold start. After this, the temperature is controlled to approx.
700 °C. An exhaust temperature is determined from various engine operating data for this purpose and the sensor heated accordingly.
Different values apply to the O2 sensor heaters downstream of TWC.