P0131 Mazda -

Question

what do I do we had our check engine light on and took it to shop and paid for code tester and smoke test and fuel 4 step cleaning and new oxygen sensor and it still comes on with check engine light p0131 what can I do to fix these problem on 2007 mazda 5 helpppppppppppp

Answer 1

P0131 Front H20S circuit low input

The PCM monitor the input  voltage from the front 02 sensor if input does not exceed 0,1 volts The PCM detemines the sensor circuit in non operational, Check the harness to and from the 02 sensor , A short or a open circuit of the 02 sensor  can cause this code to appear , Other than that you may need a PCM as the solution