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| I just bought a tractor, and it started throwing code 4346 "def pressure line heater" open circuit and then it starts to derate the engine rpm's. I had cat come out and look at it. They said to start with the pressure heater hose which has a wiring connection sorrounding it to keep it warm. I changed that hose yesterday. It worked all day and threw the code one time. Today, it has thrown it several times, and now it just started throwing a new code 4357 "pressure line def heater relay" shorted to high source. The cat guy didn't seem like he could diagnose these issues. He seemed more like, we will start with this part and if that doesn't work, change another part. Any ideas? | |
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Having DEF issues on a MT765d
