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Home >> Volvo >> 2009 >> C30 R-Design, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control Module (ECM) Diagnostic Trouble Codes - 1 Of 8 >> ECM-2110: Front Heated Oxygen Sensor (Ho2S). Signal Too Low (B5244S4; 2007-2010) >> Signal Too Low (2007) >> Checking Fuses

Checking Fuses

All heated oxygen sensors are supplied with voltage with the same lead. If the lead is damaged, e. g., fuse on the lead, then diagnostic code for heating for all heated oxygen sensors will be stored.

Therefore, check first if diagnostic trouble codes for heating are also stored for other heated oxygen sensors.

HINT: Brake vacuum pump is supplied with voltage via the same lead as the heated oxygen sensors. A damaged brake vacuum contact can lead to the pump running continuously and in the long-term be overheated and damaged. In turn, this leads to damaged fuse. 

HINT: Therefore, check the brake vacuum switch and pump before any continued troubleshooting is done on the heated oxygen sensors. 

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