OBD Guide
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P11C4

Intake Air Humidity Sensor Circuit Erratic

P11C4 is an OBD-II diagnostic trouble code meaning: Intake Air Humidity Sensor Circuit Erratic. Common causes: damage to the air humidity sensor wiring harness, poor contact in the sensor connector. Estimated repair cost: $17–56.

Severity
⚠️ Medium
Can you drive?
Yes, but get it checked soon
Approx. repair cost
$17–56 (est.)

Symptoms

  • Unstable engine operation at idle
  • Increased fuel consumption
  • Reduced engine power
  • Check Engine Light Illuminates

Causes

  • Damage to the air humidity sensor wiring harness
  • Poor contact in the sensor connector
  • Air humidity sensor malfunction
  • Short circuit or open circuit
  • Moisture ingress or contact corrosion

How to Fix

  1. Check the condition of the sensor wiring harness and connectors
  2. Clean the connector contacts from dirt and corrosion.
  3. Test the air humidity sensor with a multimeter
  4. If necessary, replace the air humidity sensor
  5. Reset the error and check if it returns

Related codes

P11C3P11C5

FAQ

What does the P11C4 code mean?

P11C4 is an OBD-II diagnostic trouble code that indicates: Intake Air Humidity Sensor Circuit Erratic

What causes a P11C4 error code?

The most common causes of P11C4 include: Damage to the air humidity sensor wiring harness; Poor contact in the sensor connector; Air humidity sensor malfunction; Short circuit or open circuit.

How do I fix a P11C4 diagnostic trouble code?

To fix P11C4: Check the condition of the sensor wiring harness and connectors. Clean the connector contacts from dirt and corrosion.. Test the air humidity sensor with a multimeter. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with P11C4?

Yes, but get it checked soon

How much does it cost to fix P11C4?

The estimated repair cost for P11C4 is $17–56. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat