Codes 335, 336 & 337....ideas?
I have a CEL on my truck that comes on few a couple minutes, then goes off for a few minutes and continues.
I scanned her today and got three codes, 335, 336, and 337.
335 = EGR sensor circuit voltage higher or lower then expected.
336 = EGR sensor circuit voltage higher then expected.
337 = EGR sensor circuit above maximum voltage.
any ideas what i could look for and where?
1994 3.0 4x4