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My 1999 Hyundai Accent puts out code P0135, why would it keep draining my battery?

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My 1999 Hyundai Accent puts out code P0135, why would it keep draining my battery?

Vehicle: 1999 Hyundai Accent

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Hi there,

This code points to an issue with the O2 sensor. It will not cause your battery to drain. Here is some info regarding this code.

P0135 HYUNDAI - O2 Sensor Heater Circuit Malfunction Bank 1 Sensor 1 
Read more: https://www.autocodes.com/p0135_hyundai.html

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