OBD Guide
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P122E

Nitrogen Oxide Sensor Binary Oxygen Sensor Line Disconnection

P122E is an OBD-II diagnostic trouble code meaning: Nitrogen Oxide Sensor Binary Oxygen Sensor Line Disconnection. Common causes: broken wires to the nox sensor, damage to the sensor connector. 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
  • Possible increase in fuel consumption
  • Reduced engine power
  • Problems with diesel particulate filter regeneration
  • Increased level of harmful emissions

Causes

  • Broken wires to the NOx sensor
  • Damage to the sensor connector
  • Contact corrosion
  • Malfunction of the NOx sensor itself
  • Wiring Harness Problems

How to Fix

  1. Check the integrity of the wiring to the sensor
  2. Inspect connectors for corrosion
  3. Check sensor circuit resistance
  4. Test NOx sensor
  5. Replace sensor if necessary

Related codes

P122FP1230P1231

FAQ

What does the P122E code mean?

P122E is an OBD-II diagnostic trouble code that indicates: Nitrogen Oxide Sensor Binary Oxygen Sensor Line Disconnection

What causes a P122E error code?

The most common causes of P122E include: Broken wires to the NOx sensor; Damage to the sensor connector; Contact corrosion; Malfunction of the NOx sensor itself.

How do I fix a P122E diagnostic trouble code?

To fix P122E: Check the integrity of the wiring to the sensor. Inspect connectors for corrosion. Check sensor circuit resistance. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with P122E?

Yes, but get it checked soon

How much does it cost to fix P122E?

The estimated repair cost for P122E is $56–167. Actual cost depends on your vehicle, location, and labor rates.

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