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Carman scanFor EMS PROfesor
1.14.4 O2 Sensor Heater Field Service Example
Field example of O2 sensor heater malfunction : Crack of tip
HMC vehicles for US market : O2 sensor malfunction is many taken place in early
winter season
Cause of
O2 sensor heater should be operated after removing humidity around tip.
But as soon as engine is started, O2 sensor is heated at the same time.
It result in crack of O2 sensor tip.
Signal view
Vehicle which is manufactured before 1995 year
(BOSCH O2 sensor:Frequently occurrence, Woojin O2 sensor:Sometimes occurrence)
O2 sensor signal with problem occurrence
O2 sensor signal is not switched (Always constant).