P1726 Insufficient Engine Speed Decrease During Self-Test
What does P1726 mean on a Ford?
P1726 — Insufficient Engine Speed Decrease During Self-Test. This Ford-enhanced code applies to All OBD-II Ford vehicles.
Common causes of P1726
- Throttle held open during the coast-down phase
- Sticking throttle plate
- Vacuum leak holding RPM high
- Faulty IAC holding idle up
- Cruise control interference
How to fix P1726
- Release the throttle fully when prompted
- Check for sticking throttle or high idle causes
- Smoke test for vacuum leaks
- Verify IAC operation
- Re-run the test hands-off