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I have OBDII code C1242 on my 2000 Toyota Prius 11 1500, how do I repair this error?

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I have OBDII code C1242 on my 2000 Toyota Prius 11 1500, how do I repair this error?

Vehicle: 2000 Toyota Prius 11 1500

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C1242 Power source circuit

The vehicle auxillary battery should be checked, replace if low. You would need to do this before diagnosis into the ABS system,
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C1242 Toyota Code - IG2 Power Source Circuit
Read more: https://www.autocodes.com/c1242_toyota.html

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