Diagnostic Trouble Code (DTC) Information ECM-289A

Condition 

Fig 1: Front Heated Oxygen Sensor

Courtesy of VOLVO CARS OF NORTH AMERICA.

The engine control module (ECM) monitors the operation of the front heated oxygen sensor (HO2S) by checking its signal. The diagnostic trouble code (DTC) is stored if the engine control module (ECM) registers that the heated oxygen sensor (HO2S) only indicates air and no fuel/air mixture.

Substitute Value 

• The heated oxygen sensor (HO2S) control is disabled
• Three-way catalytic converter (TWC) diagnostics are disabled.

Possible Source 

• Incorrectly installed heated oxygen sensor (HO2S)
• Damaged front heated oxygen sensor (HO2S).

Fault symptom[s] 

• Malfunction indicator lamp (MIL) lit.