OBD Guide
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P11D3

NOx Sensor 1 Exceeded Minimum Learning Limit

P11D3 is an OBD-II diagnostic trouble code meaning: NOx Sensor 1 Exceeded Minimum Learning Limit. Common causes: nox sensor 1 malfunction, damage to sensor wiring or connectors. Estimated repair cost: $56–167.

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

Symptoms

  • Check Engine light comes on
  • Increased fuel consumption
  • Reduced engine power
  • Increased level of harmful emissions
  • Unstable engine idling

Causes

  • NOx sensor 1 malfunction
  • Damage to sensor wiring or connectors
  • Problems with the Exhaust Gas Recirculation (EGR) system
  • Malfunction of the catalytic converter
  • Software error in the engine control unit

How to Fix

  1. Check the condition of NOx sensor 1 and its connectors
  2. Check the integrity of the wiring to the sensor
  3. Check the operation of the EGR system
  4. Check the condition of the catalytic converter
  5. If necessary, replace NOx sensor 1

Related codes

P11D4P11D5P11D6

FAQ

What does the P11D3 code mean?

P11D3 is an OBD-II diagnostic trouble code that indicates: NOx Sensor 1 Exceeded Minimum Learning Limit

What causes a P11D3 error code?

The most common causes of P11D3 include: NOx sensor 1 malfunction; Damage to sensor wiring or connectors; Problems with the Exhaust Gas Recirculation (EGR) system; Malfunction of the catalytic converter.

How do I fix a P11D3 diagnostic trouble code?

To fix P11D3: Check the condition of NOx sensor 1 and its connectors. Check the integrity of the wiring to the sensor. Check the operation of the EGR system. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with P11D3?

Yes, but get it checked soon

How much does it cost to fix P11D3?

The estimated repair cost for P11D3 is $56–167. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat