Heavy Equipment Repair Questions? Ask an Expert Now.
12 usually means mechanical failure..internal problem..sticking..
146 means the egr valve towards the front of the engine..let me know how you do.
it looks like a oem specific reason and i don't have it at this time,the above is for all others. but it looks like as the numbers are lower its a electrical problem as the get higher it points to a mechanical problem.let me know if you have any more questions.