Diagnostic Trouble Code (DTC) Information ECM-24EC

Condition 

Fig 1: Identifying Rear Heated Oxygen Sensor (HO2S)

Courtesy of VOLVO CARS CORPORATION

The engine control module (ECM) checks the signal from the rear heated oxygen sensor (HO2S). The diagnostic trouble code (DTC) is stored if the engine control module (ECM) registers that the heated oxygen sensor (HO2S)reacts too slowly for changes in the fuel/air mixing and the control module interprets this as a fault.

The diagnostic trouble code can be diagnosed when driving.

Substitute Value 

• Nothing.

Possible Source 

• Contact resistance and oxidation in the connections.
• Damaged rear heated oxygen sensor (HO2S).

Fault symptom[s] 

• Malfunction indicator lamp (MIL) lit.