Diagnostic Trouble Code (DTC) Information ECM-25AB

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 an open-circuit in the ground lead for the front heated oxygen sensor (HO2S) (bank 2).

Substitute Value 

• None.

Possible Source 

• Open-circuit in the ground lead
• Damaged front heated oxygen sensor (HO2S) (bank 2).

Fault symptom[s] 

• Malfunction indicator lamp (MIL) lit.