  The full CMS Run 2 datasets with time-integrated luminosity of 137 fb$^{-1}$
in the diboson channels are used to probe benchmark models with extended gauge
sectors such as $E_6$, left-right symmetric (LR) and the sequential standard
model (extended gauge model, EGM), that predict the existence of neutral $Z'$-
and charged $W'$-bosons decaying to a pair of bosons $WW$, $ZH$, $WZ$ and $WH$
in the semileptonic final state. These benchmark models are used to interpret
the results. Exclusion limits at the 95% C.L. on the $Z'$ and $W'$ resonance
production cross section times branching ratio to electroweak gauge boson pairs
in the resonance mass range between 1.0 and 4.5 TeV are here converted to
constraints on $Z$-$Z'$ and $W$-$W'$ mixing parameters and masses. We present
exclusion regions on the parameter spaces of the $Z'$ and $W'$ and show that
the obtained exclusion regions are significantly extended compared to those
derived from the previous analysis performed with Tevatron data as well as with
the CMS data collected at 7 and 8 TeV in Run 1. The reported limits are the
most restrictive to date.

High Energy Physics - Phenomenology