P CODES (POWERTRAIN) P0500 - P0599 P0526 Questions

So, The Cooling Fan And Water Pump Have Been Changed, Wiring Harness Was Also Changed But I Notice There Looks To Be Two Gray Wires. Could...

Vehicle Is Throwing Both Codes Listed In The Subject, P0171 And P0526. A New Fan And Fan Motor Has Been Put In. No Leaks Have Been Detected...