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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-2B2A: Rear Lambda Probe Pre-Heating, Bank 2. No Signal. Intermittent Fault. (B6284T; 1999-2001) >> Signal missing. Intermittent fault >> Checking cables and connectors

Checking cables and connectors

Check heated oxygen sensor (HO2S) connector for contact resistance and oxidation according to Contact resistance and oxidation and loose connections according to Loose connections (terminals)

Check signal cable between heated oxygen sensor (HO2S) #2 and control module #A35 (#A35) and power supply between system relay #3 and heated oxygen sensor (HO2S) #1 for an intermittent open-circuit according to Open-circuit, intermittent faults .

Other information 

Fig 1: Identifying Rear Heated Oxygen Sensor (HO2S) Connector
GLL104129Courtesy of VOLVO CARS OF NORTH AMERICA.
Fig 2: Identifying Ohmmeter
GLL101042Courtesy of VOLVO CARS OF NORTH AMERICA.
Fig 3: Identifying Rear Heated Oxygen Sensor (HO2S)
GLL102933Courtesy of VOLVO CARS OF NORTH AMERICA.