P1507 on Ford
Idle Air Control Underspeed Error
P1507 on Ford vehicles indicates idle air control underspeed error. Au7o has documented this code across 1 Ford model — most commonly on Ranger. This manufacturer-specific code (common on Ford, Lincoln, Mazda, Mercury) means the engine computer detected idle speed lower than the target the Idle Air Control (IAC) system is commanding. The IAC valve regulates air into the engine at idle to keep RPM steady; when the engine idles too low or stalls despite commands to raise it, this underspeed code sets. Symptoms include rough idle, low idle, or stalling at stops. It typically points to a dirty or failing IAC valve, a dirty throttle body, or a restriction in airflow. Typical repair costs on Ford range from $100 to $450, depending on the specific model and root cause.
Common Causes of P1507
- •Dirty, sticking, or faulty idle air control (IAC) valve
- •Carbon-clogged throttle body or IAC passage
- •Restricted air intake or clogged air filter
- •Vacuum leak affecting idle control
- •Faulty PCV system
- •Wiring or connector fault at the IAC valve
P1507 on Ford by Model
Ford Ranger(1 issue)
- Throttle Position Sensor and Idle Air Control Related Stalling/Hanging Idle2000-2011
Many owners of 2000-2011 Rangers report intermittent high idle, unstable idle, or stalling when coming to a stop, often traced to a failing throttle position sensor, dirty or failing idle air control valve, or both. The problem is especially common on older cable-throttle trucks where carbon buildup and sensor wear accumulate with age. Symptoms can be inconsistent, which leads to repeated parts swapping before the root cause is isolated.
Looking for P1507 on a different make?
View P1507 across all makes →Frequently Asked Questions
What does P1507 mean on Ford?▼
P1507 stands for "Idle Air Control Underspeed Error." This manufacturer-specific code (common on Ford, Lincoln, Mazda, Mercury) means the engine computer detected idle speed lower than the target the Idle Air Control (IAC) system is commanding. The IAC valve regulates air into the engine at idle to keep RPM steady; when the engine idles too low or stalls despite commands to raise it, this underspeed code sets. Symptoms include rough idle, low idle, or stalling at stops. It typically points to a dirty or failing IAC valve, a dirty throttle body, or a restriction in airflow. On Ford specifically, this code is documented across 1 model.
What causes P1507 on Ford vehicles?▼
Common causes on Ford: Dirty, sticking, or faulty idle air control (IAC) valve, Carbon-clogged throttle body or IAC passage, Restricted air intake or clogged air filter, Vacuum leak affecting idle control, Faulty PCV system. Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix P1507 on a Ford?▼
Repair costs on Ford range from $100 to $450, depending on the specific model and root cause.
Which Ford models have P1507 documented?▼
Au7o has documented P1507 on 1 Ford model: Ranger.