Negatively controls expression of the farAB operon by binding directly to the farAB promoter region (PubMed:14645274, PubMed:16796676). Binds to three sites (sites A, B and C) within the DNA sequence upstream of farA (PubMed:16796676). Also represses its own expression (PubMed:14645274). Repressor activity requires the presence of the Integration Host Factor (IHF), which binds to sequences located between FarR binding sites A and C. IHF binding to the promoter region stabilizes the binding of FarR to its binding sites A and C and as a consequence, enhances repression of the farAB operon. Repressed by the HTH-type transcriptional regulator MtrR. Negatively autoregulated.