OBD Guide
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P11D2

O2 Signal Circuit High Voltage (NOx Sensor 2)

P11D2 is an OBD-II diagnostic trouble code meaning: O2 Signal Circuit High Voltage (NOx Sensor 2). Common causes: nox sensor malfunction, open or short circuit in the sensor circuit. Estimated repair cost: $56–167.

Severity
🔴 High
Can you drive?
Yes, but get it checked soon
Approx. repair cost
$56–167 (est.)

Symptoms

  • Check Engine light comes on
  • Possible loss of engine power
  • Increased fuel consumption
  • Increased emissions
  • The car may go into emergency mode

Causes

  • NOx sensor malfunction
  • Open or short circuit in the sensor circuit
  • Problems with the sensor wiring harness
  • Engine control module malfunction
  • Poor contact in the sensor connector

How to Fix

  1. Check the integrity of the wiring to the NOx sensor
  2. Check sensor connections and connectors
  3. Test the NOx sensor with a multimeter
  4. Replace NOx sensor if necessary
  5. Reset the error code and check the system

Related codes

P11D1P11D3P11D4

FAQ

What does the P11D2 code mean?

P11D2 is an OBD-II diagnostic trouble code that indicates: O2 Signal Circuit High Voltage (NOx Sensor 2)

What causes a P11D2 error code?

The most common causes of P11D2 include: NOx sensor malfunction; Open or short circuit in the sensor circuit; Problems with the sensor wiring harness; Engine control module malfunction.

How do I fix a P11D2 diagnostic trouble code?

To fix P11D2: Check the integrity of the wiring to the NOx sensor. Check sensor connections and connectors. Test the NOx sensor with a multimeter. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with P11D2?

Yes, but get it checked soon

How much does it cost to fix P11D2?

The estimated repair cost for P11D2 is $56–167. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat