Hydrocarbons is unburnt or raw fuel. Possible causes are dirty injectors, PCV valve, EVAP solenoid, fuel pressure regulator, bad VAFM, dirty air filter or restriction in airway, low cylinder compression, worn spark plugs, weak ignition coil, coolant temperature sensor out of range, intake air temperature sensor out of range or bad oxygen sensor. That is all I can think of. Since you have 200k on it I would lean (pun inteneded
) towards dirty injectors, bad O2, EVAP system and VAFM out of wack.