Diagnostic trouble code (DTC) information ECM-280C

Condition 

Diagnostic trouble code (DTC) ECM-280C is stored if the engine control module (ECM) detects that both front heated oxygen sensors (HO2S) bank 1 and 2 have been switched (mounted in the incorrect bank of cylinders). The diagnostic trouble codes (DTCs) are diagnosed when the engine has been idling for 10 minutes

Substitute Value 

• Long-term fuel trim is switched off
• Three-way catalytic converter (TWC) diagnostics are disabled.

Possible Source 

Faulty signal: 

• Front heated oxygen sensors (HO2S) are mounted in the incorrect cylinder banks
• Fuel injection system leakage
• Both the front heated oxygen sensors (HO2S) are defective.

Fault symptom[s] 

• Malfunction indicator lamp (MIL) lit.