C1726 on Ford
Steering Torque Sensor Signal Invalid
C1726 on Ford vehicles indicates steering torque sensor signal invalid. Au7o has documented this code across 1 Ford model — most commonly on Expedition. C1726 is a steering/chassis code indicating the steering torque sensor is sending an invalid or implausible signal. On electric power steering (EPS) systems, the torque sensor measures how hard you're turning the wheel so the system knows how much assist to provide. When the EPS module receives a signal that's out of range, erratic, or doesn't agree with its internal checks, it flags the data as invalid. It generally results in reduced or lost power-steering assist (heavier steering), with a steering or EPS warning light, even though the car remains steerable. Typical repair costs on Ford range from $200 to $1,500, depending on the specific model and root cause.
Common Causes of C1726
- •Faulty steering torque sensor
- •Wiring or connector fault in the torque sensor circuit
- •Loss of or unstable sensor reference/supply voltage
- •Corrosion or moisture in the steering column connectors
- •Torque sensor not calibrated/initialized after service
- •Internal EPS module fault
- •Low battery voltage affecting sensor operation
C1726 on Ford by Model
Ford Expedition(2 issues)
- Air Suspension Compressor Failure and Rear Sag2003-2017
The 2003-2017 Ford Expedition with optional air suspension (standard on Eddie Bauer, King Ranch, Platinum, and EL/MAX trims) suffers from air suspension compressor failure, air spring leaks, and ride height sensor malfunctions. The compressor, located under the vehicle, is exposed to road debris, salt, and moisture which degrades the motor and valves. When air springs develop leaks, the compressor runs continuously trying to maintain ride height, leading to premature burnout. RepairPal estimates compressor replacement between $666 and $724, though dealer pricing can reach $1,200. NHTSA has received hundreds of complaints regarding air suspension failures. Strutmasters.com notes that 2007-2011 Expedition and Navigator share the same air suspension system and failure patterns. Many owners opt for air-to-coil spring conversion kits as a permanent, lower-cost solution.
- Air Suspension Compressor Failure and Sag2003-2025
Expeditions equipped with the rear air suspension system experience compressor failure, causing the rear of the vehicle to sag. The compressor wears out from overwork — it cycles frequently due to slow air leaks in the air springs (bags) and supply lines. When the compressor fails, the rear drops to the bump stops, creating a nose-up stance and poor ride quality. The air springs themselves develop dry rot cracks and leak, particularly in dry or hot climates.
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View C1726 across all makes →Frequently Asked Questions
What does C1726 mean on Ford?▼
C1726 stands for "Steering Torque Sensor Signal Invalid." C1726 is a steering/chassis code indicating the steering torque sensor is sending an invalid or implausible signal. On electric power steering (EPS) systems, the torque sensor measures how hard you're turning the wheel so the system knows how much assist to provide. When the EPS module receives a signal that's out of range, erratic, or doesn't agree with its internal checks, it flags the data as invalid. It generally results in reduced or lost power-steering assist (heavier steering), with a steering or EPS warning light, even though the car remains steerable. On Ford specifically, this code is documented across 1 model.
What causes C1726 on Ford vehicles?▼
Common causes on Ford: Faulty steering torque sensor, Wiring or connector fault in the torque sensor circuit, Loss of or unstable sensor reference/supply voltage, Corrosion or moisture in the steering column connectors, Torque sensor not calibrated/initialized after service. Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix C1726 on a Ford?▼
Repair costs on Ford range from $200 to $1,500, depending on the specific model and root cause.
Which Ford models have C1726 documented?▼
Au7o has documented C1726 on 1 Ford model: Expedition.