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Home >> Volvo >> 2004 >> S80 Base, 2.5 59, FWD >> Repair and Diagnosis >> Engine Performance >> Testing & Diagnosis >> Engine Control Module (ECM) Diagnostic Trouble Codes - 5 Of 11 >> ECM-2A0A: Rear Heated Oxygen Sensor (Ho2S). Signal Missing. Intermittent Fault (B6284T; 1999-2001) >> Signal missing. Intermittent fault >> Checking wiring and connectors

Checking wiring and connectors

CAUTION:

Do not apply rust solvent spray or grease to the heated oxygen sensor (HO2S) connector.

Check the heated oxygen sensor (HO2S) connector. Check for contact resistance and oxidation. Check for loose connections.

Check the signal cable (+) between heated oxygen sensor (HO2S) terminal #4 and control module terminal #A61 (#B1). Check the signal cable (-) between heated oxygen sensor (HO2S) terminal #3 and control module terminal #A62 (#B2). Check for an intermittent open-circuit.

Other information: 

Fig 1: Identifying Heated Oxygen Sensor
GLL104128Courtesy of VOLVO CARS OF NORTH AMERICA.
Fig 2: Identifying Ohmmeter
GLL101042Courtesy of VOLVO CARS OF NORTH AMERICA.
Fig 3: Identifying Rear Heated Oxygen Sensor
GLL102934Courtesy of VOLVO CARS OF NORTH AMERICA.