Cost replace a fuel filter, air intake heater relay, exhaust backpressure sensor

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How much should it cost to replace a fuel filter, air intake heater relay, and exhaust backpressure sensor on a 2000 Ford 4WD Excursion with 7.3 litre Powerstroke diesel turbo? This was determined by diagnostics run at a shop after the "check engine" light came on and my wife brought the car into the shop. The vehicle was running fine with no symptoms, other than the illuminated "check engine" light.