p1486 manufactur control auxiliary emissions controls on 2000 honda accord what does that mean what needs to be replaced

This can be a tricky code to diagnose if you don't have the right tools and equipment.

DTC P0128 and/or P1486 can set occasionally just because the hood is opened. If your DTC during conditions other than that, read the following:

Check the engine coolant level. Is the engine coolant level low?
YES - Refill the engine coolant. If necessary, check the cooling system.
NO - Go to step 2.

Turn the ignition switch ON, and make sure the A/C is off.
Check the radiator fan. Does the radiator fan keep running?
YES - Check the radiator fan circuit with A/C model or without A/C model, radiator fan switch circuit, and the radiator fan switch. If the circuits and the switch are OK, substitute a known-good ECM/PCM and recheck. If the symptom/indication goes away, replace the original ECM/PCM.
NO - Test the thermostat.