Cm870 acting dumb.

[Chamberpains]

Make sure the EGR pipe from the cooler around the back of the block is all intact and no broken or loose clamps or hoses. Typical 3 sensors are exhaust pressure sensor, intake pressure and intake temp. I replace mine annually. But i believe the differential pressure tubes have sensors and they soot up along with the tubes. Make sure they're in good clean working order. It's been so long since i pulled all that junk off, i cant remember what all was on it originally.