  We study the reconstructed deceleration parameter splitting the data in
different redshift bins, fitting both a cosmographic luminosity distance and
also assuming a flat $\Lambda$CDM model, using the Pantheon+ sample of type Ia
supernova data (SNIA).
  We observe tensions $\sim 2\sigma-3\sigma$ for different redshift and
distance indicators if the full sample is used. However, those tensions
disappear when the SNIA at $z<0.008$ are removed. If the data is splitted in 2
hemispheres according to our movement w.r.t CMB, a strange $3.8 \sigma$ tension
appears in one of the samples between particular redshift bins. Finally,
considering posterior distribution as Gaussian, general linear model prefers a
positive slope for $q_0$ across redshift bins opposed to a zero slope expected
in a $\Lambda$CDM universe. We discuss possible explanations for our results
and the influence of lowest redshift SNIA data in cosmological analysis.
