OBD Guide
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P126C

Nitrogen Oxide Sensor Adjustment Fault At Start Of Charging Phase

P126C is an OBD-II diagnostic trouble code meaning: Nitrogen Oxide Sensor Adjustment Fault At Start Of Charging Phase. Common causes: nox sensor malfunction, damage to the wiring to the sensor. 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
  • Deterioration of vehicle dynamics
  • Increased fuel consumption
  • Increased NOx emissions
  • Possible problems with passing technical inspection

Causes

  • NOx sensor malfunction
  • Damage to the wiring to the sensor
  • Problems with the engine control unit
  • NOx sensor contamination
  • SCR system malfunction

How to Fix

  1. Check the status of the NOx sensor
  2. Check the integrity of wiring and connectors
  3. Clean the sensor from dirt
  4. Replace NOx sensor if necessary
  5. Check the operation of the SCR system

Related codes

P126DP126EP2200

FAQ

What does the P126C code mean?

P126C is an OBD-II diagnostic trouble code that indicates: Nitrogen Oxide Sensor Adjustment Fault At Start Of Charging Phase

What causes a P126C error code?

The most common causes of P126C include: NOx sensor malfunction; Damage to the wiring to the sensor; Problems with the engine control unit; NOx sensor contamination.

How do I fix a P126C diagnostic trouble code?

To fix P126C: Check the status of the NOx sensor. Check the integrity of wiring and connectors. Clean the sensor from dirt. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with P126C?

Yes, but get it checked soon

How much does it cost to fix P126C?

The estimated repair cost for P126C is $56–167. Actual cost depends on your vehicle, location, and labor rates.

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