Diagnostic Trouble Code (DTC) Information ECM-2400

Condition 

Fig 1: Front Heated Oxygen Sensor

Courtesy of VOLVO CARS CORPORATION

The diagnostic trouble code (DTC) is stored if the engine control module (ECM) registers that the front heated oxygen sensor (HO2S) has not reached normal operating temperature.

Substitute Value 

None.

Possible Source 

• Contact resistance and oxidation in the terminals
• Damaged front heated oxygen sensor (HO2S).

Fault symptom[s] 

• Malfunction indicator lamp (MIL) lit.