I will cut and paste the info you are looking for from the hd manual. i would sugest to check the sensor wires to see if the came unplugged or melted by the pipe. Table 4-26. Code Description DTC DESCRIPTION P0131 Front O2 sensor low or engine running lean P0132 Engine running rich P0134 Front O2 sensor open/not responding/high P0151 Rear O2 sensor low or engine running lean P0152 Engine running rich P0154 Rear O2 sensor open/not responding/high
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its the rear oc senser. go **** yourself
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