P00F4 — Humidity Sensor Circuit Low

What Does P00F4 Mean?

P00F4 is a diagnostic trouble code indicating: Humidity Sensor Circuit Low. This code relates to the fuel and air metering system. The vehicle's computer detected a condition outside normal operating parameters and stored this code.

Symptoms of P00F4

⚠️ Check Engine Light (MIL) illuminated
⚠️ Humidity Sensor reading at zero or minimum value
⚠️ Related system not functioning or in fail-safe mode
⚠️ Poor fuel economy

Common Causes

🔍 Open or broken wire in Humidity Sensor circuit
🔍 Poor ground connection at Humidity Sensor
🔍 Faulty Humidity Sensor with no output signal
🔍 Disconnected or loose Humidity Sensor connector
🔍 Blown fuse in related circuit

Frequently Asked Questions

What does P00F4 mean?

P00F4 indicates: Humidity Sensor Circuit Low. The vehicle's computer has detected that the Humidity Sensor is not operating within its expected parameters and stored this diagnostic trouble code.

Can I drive with code P00F4?

You can drive short distances for essential trips, but schedule a diagnosis soon. Driving with P00F4 for extended periods may cause additional problems.

How much does it cost to fix P00F4?

Repair costs for P00F4 typically range from $20 to $300, depending on the root cause. Simple wiring or connector repairs are on the lower end, while component replacement costs more. A proper diagnosis ($80–$150 at most shops) will identify the exact cause before committing to expensive parts.

What To Do Next

Possible Fixes

🔧 Repair broken wire or restore ground in Humidity Sensor circuit
🔧 Clean and secure Humidity Sensor connector and ground points
🔧 Replace failed Humidity Sensor

1
Find your vehicle above
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2
Check for recalls
Go to nhtsa.gov/recalls and enter your VIN. Free repairs if covered.
3
Get a professional diagnosis
A code alone doesn't identify the exact failed part. A diagnostic ($50–$150) pinpoints the root cause.

P00F4: Humidity Sensor Circuit Low