OBD Guide
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P11FE

O2 Low Reference Circuit High Voltage (NOx Sensor 2)

P11FE is an OBD-II diagnostic trouble code meaning: O2 Low Reference Circuit High Voltage (NOx Sensor 2). Common causes: nox 2 sensor malfunction, open or short circuit in wiring. Estimated repair cost: $89–244.

Severity
⚠️ Medium
Can you drive?
Yes, but get it checked soon
Approx. repair cost
$89–244 (est.)

Symptoms

  • Check Engine Light Is On
  • Reduced engine power
  • Increased fuel consumption
  • Problems with passing technical inspection
  • Rough engine idling

Causes

  • NOx 2 sensor malfunction
  • Open or short circuit in wiring
  • Poor contact in the sensor connector
  • Contact corrosion
  • Problems with the engine control unit

How to Fix

  1. Check the integrity of the wiring to the NOx sensor 2
  2. Inspect the sensor connector for damage and corrosion.
  3. Check the resistance and voltage at the sensor
  4. If necessary, replace NOx 2 sensor
  5. Reset the fault code and check for its presence after repair

Related codes

P11FFP11FDP2200

FAQ

What does the P11FE code mean?

P11FE is an OBD-II diagnostic trouble code that indicates: O2 Low Reference Circuit High Voltage (NOx Sensor 2)

What causes a P11FE error code?

The most common causes of P11FE include: NOx 2 sensor malfunction; Open or short circuit in wiring; Poor contact in the sensor connector; Contact corrosion.

How do I fix a P11FE diagnostic trouble code?

To fix P11FE: Check the integrity of the wiring to the NOx sensor 2. Inspect the sensor connector for damage and corrosion.. Check the resistance and voltage at the sensor. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with P11FE?

Yes, but get it checked soon

How much does it cost to fix P11FE?

The estimated repair cost for P11FE is $89–244. Actual cost depends on your vehicle, location, and labor rates.

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