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Had pending code P0131-low voltage at b1s1 O2 Sensor-replaced sensor-Cleared code-performed drive cycle-code came back on -P0131 no CEL on dashboard
Vehicle: 2003 Mercedes Benz CLK 320

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P0131 Oxygen sensor circuit low voltage bank 1 sensor 1

Check the fuse for this located in the engine compartment listed as fuse 43 replace if open. Bank 1 is the right side, before the catalytic convertor.

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