New Flyer Industries Canada ULC (New Flyer) is recalling certain model year 2009 C35LF and L40LFR, model year 2009-2012 C35LFR, model year 2008-2013 C40LF and C40LFR, model year 2013 XN35, model year 2011-2013 XN40 and model year 2012-2013 XN60 transit buses equipped with certain Cummins Westport Model ISL G engines. In the affected vehicles, condensation in the intake manifold may freeze during cold weather conditions and interfere with the proper operation of the intake manifold pressure sensor.