Average Cost: The average cost for a flame sensor replacement in a furnace repair service is estimated to be around $80 to $200 depending on the type and quality of the accessory, the complexity of the job, and the location and service provider.

Cost Breakdown: The cost of a flame sensor replacement usually includes the cost of the part itself, which ranges from $20 to $50, and the labor cost, which ranges from $60 to $150. The labor cost may be higher depending on the complexity of the job and the location and service provider.

Factors Affecting Cost: The type and quality of the accessory, the complexity of the job, and the location and service provider are the main factors that can affect the cost of a flame sensor replacement. The type and quality of the accessory will determine the cost of the part itself and the complexity of the job will determine the cost of the labor. The location and service provider will also affect the labor cost.