I was clearing snow with my 4CX-14 the other day and and the DEF light came on and it went into limp mode before I could return to the shop. This happened about six months ago and I was told the previous operator had never changed the DEF. The machine does not get used much. I changed the fluid and it has worked fine up to now. My question is would changing the DEF filter and the DEF breather make a difference?
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