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We report fully differential photoelectron spectra from an {\it ab-inito}coupled channels treatment of CO$_2$. Photoionization by laser pulses centeredat 400 nm and 800 nm wavelength are considered, with arbitrary molecularalignment and polarization (linear and elliptic). Calculations revealsignificant excited state channel contributions that are, at certain molecularorientations, an order of magnitude larger than the ground state channel in therescattering plateau. Partial wash out of the multiphoton structure in the ATIspectra and of the nodal features in angle resolved spectra is observed due toionization to excited state channels. The qualitative nature of the spectra isdetermined by ionization thresholds, orbital symmetries and interchannelcoupling in the order of precedence.

Multielectron effects in strong field ionization of CO$_2$: impact on differential photoelectron spectra