Engine

P00F2 — Humidity Sensor Circuit Open

Severity: low Safe to drive

What P00F2 means

The engine control unit monitors a humidity sensor, usually located in or near the intake air path. Its data helps fine-tune fuel mixture, ignition timing and emissions functions such as EGR. P00F2 is set when the signal is missing or out of range in a way that points to an open circuit.

Symptoms

  • Check Engine light on
  • Slight loss of power or sluggish throttle response
  • Slightly higher fuel consumption
  • Occasional rough idle
  • Other codes related to intake sensors or EGR

Possible causes

  1. Failed humidity sensor
  2. Open or damaged wiring to the sensor
  3. Corroded or loose connector terminals
  4. Missing power or ground at the sensor
  5. Rarely, a faulty engine control module

How to diagnose

  1. Read all codes and freeze frame data, clear the code and see whether it returns
  2. Inspect the sensor, connector and harness for damage, moisture, corrosion or chafing
  3. Unplug the connector and check the terminals for corrosion and a tight fit
  4. Use a multimeter to check power and ground at the connector according to the wiring diagram
  5. Test the signal wire back to the control module for opens and shorts
  6. Watch the sensor reading on a scan tool and compare it with the actual conditions
  7. If the wiring is good, test the sensor to spec or swap in a known good one

Common fixes

  • Clean the connector terminals and restore a secure fit
  • Repair or replace damaged wiring
  • Replace the humidity sensor
  • Update software or replace the control module only if everything else is ruled out

Questions and answers

Can I drive with code P00F2?

Usually yes. The car will run on default values, but you may see slightly reduced performance and higher fuel use. Don't put off the diagnosis for long.

What most often causes P00F2?

Most often it is a poor connection at the connector, damaged wiring or the humidity sensor itself. A failed control module is very rare.

How do I clear P00F2?

Fix the cause first, then clear the code with a scan tool. If the fault is still present, it will return after a few drive cycles.

This is general information about the code. The meaning can differ between makes and models: a scan tool and the repair manual for your car will show the exact cause.