JD 850 Bulldozer EGR Fault
This JD 850J bulldozer had an EGR fault. DPS carried out an EGR delete, (software and hardware) and fixed the problem. All this for a fraction of the cost compared to replacing all the parts. This stops coolant entering the combustion camber and no dirty gases recirculating back through the engine. It is important that this delete is done properly. Talk to DPS about getting your John Deere egr valve deleted.