How do I fix the code errors?

Question

P0131 Mazda 3 error - O2 sensor ckt low voltage bank 1 sensor
in conjuction with
P2251 error - O2 sensor negative current control circuit, open bank 1 senor 1

How to fix

Answer 1

Hi there,

In most cases the sensor itself is the failed part. Over time the heater element inside burns up and causes the short and codes.