Catalyzes the reductive dechlorination of trichloroethene (TCE) to cis-1,2-dichloroethene (DCE) and of cis-1,2-dichloroethene to chloroethene (PubMed:10671186, PubMed:11097881). The substrate specificity is broad, and the enzyme can dehalogenate various substrates, including 1,1-dichloroethene (1,1-DCE), 1,2-dichloroethane and 1,2-dibromoethane (PubMed:10671186, PubMed:11097881). A variety of other haloalkanes and haloalkenes containing three to five carbon atoms are dehalogenated at lower rates (PubMed:11097881). Trans-1,2-dichloroethene (trans-DCE) and chloroethene are degraded at rates which are approximately 2 orders of magnitude lower (PubMed:10671186, PubMed:11097881). Titanium(III) citrate and methyl viologen can be used as reductants (PubMed:10671186, PubMed:11097881). AH2 + trichloroethene = (Z)-1,2-dichloroethene + A + chloride + H(+) (Z)-1,2-dichloroethene + AH2 = A + chloride + chloroethene + H(+) 1,1-dichloroethene + AH2 = A + chloride + chloroethene + H(+) Binds 2 [4Fe-4S] clusters. Loses 93% of its activity upon incubation with 1-iodopropane and titanium(III) citrate in the dark. Subsequent exposure to light restores 80% of the original activity (PubMed:10671186). Completely inhibited by 2 mM sodium sulfite or sodium dithionite, and by 1 mM cuprous chloride (PubMed:10671186). Membrane-bound. Predicted to be exported by the Tat system. The position of the signal peptide cleavage has been experimentally proven. Belongs to the PceA family.