Can a Cessna 162 Skycatcher be flown IFR in IMC?
Not in the US. The C162's POH says:


  The Model 162 Skycatcher is not equipped or certified for IFR flight


That means that under 14 CFR 91.9 it may not be operated IFR. But, FAA Order 8900.1 allows an exception for aircraft not certified for IFR to be operated under IFR in VMC only:


  A.    IFR Training in Visual Meteorological Conditions (VMC). Instrument flight training may be conducted during VMC in any aircraft
  that meets the equipment requirements of part 91, §§ 91.109, 91.205,
  and, for an airplane operated in controlled airspace under the IFR
  system, §§ 91.411 and 91.413. An aircraft may be operated on an IFR
  flight plan under IFR in VMC, provided the PIC is properly
  certificated to operate the aircraft under IFR. However, if the
  aircraft is not approved for IFR operations under its type
  certificate, or if the appropriate instruments and equipment are not
  installed or are not operative, operations in Instrument
  Meteorological Conditions (IMC) are prohibited. The PIC of such an
  aircraft must cancel the IFR flight plan in use and avoid flight into
  IMC.


An autopilot isn't required for IFR flight in the US (see 14 CFR 91.205(d)) and the question you linked. I didn't check the full equipment list to see which required instruments are missing from the C162, but even with full IFR equipment if it isn't certified for IFR then it can't be operated in IMC per the regulations above.