7A Coolant control valve mechanically - mechanical defective blocked closed - P20A0 Vent valve (Reductant Purge Control Valve) Open circuit
Coolant control valve mechanically - mechanical defective blocked closed - P20A0 Vent valve (Reductant Purge Control Valve) -open circuit
If Steering Not Working,Hydraulic suction filter plugged.Improper tire inflation.Steering linkage needs lubrication.Excessive play in steering. See your John Deere Dealer.