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Had pending code P0131 b1s1 low voltage-replaced sensor-cleared pending code-performed drive cycle-pending code came back on-Reynaldo responded to check fuse #43-fuse is good and system the fuse protects is windshield washer system according to the list.Assistance is appreciated. Effect if not corrected. Vehicle runs beatifully.
Vehicle: 2003 Mercedes Benz CLK320

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P0131 Oxygen sensor signal

​ When dealing with a P0131 it is important to check power to the 02 sensor , that or its fuse which is fuse 43, wiper motor shorting out set a P0131 or P0130. when you have this code it  is a electrical problem, being a MBZ oil leaks onto the harness could damage the wire and if it grounds the 12 volts the ECM is destroyed. Open circuit of the 02 sensor, short circuit in the signal line, or a short circuit to positive, Check the harness connection

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