P0446 EVAP Emission System Vent Control Circuit
-Probably the CCV (Canister Close Valve), this is located under the vehicle by the fuel tank.
P0171 System Too Lean
-Check your air intake boot, the boot between the air filter box and intake manifold. Due to the age, the boot has probably cracked. Remove it completely and flex it while inspecting it.
P0496 EVAP Emission System High Purge Flow
-Possibly the PCSV (Purge Control Solenoid Valve), this is located next to the throttle body.
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