OBD Guide
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P11C5

NOx Sensor 1 Heater Ground Circuit

P11C5 is an OBD-II diagnostic trouble code meaning: NOx Sensor 1 Heater Ground Circuit. Common causes: open or short circuit in the heater grounding circuit, damaged nox sensor wiring harness. Estimated repair cost: $167–333.

Severity
⚠️ Medium
Can you drive?
Yes, but get it checked soon
Approx. repair cost
$167–333 (est.)

Symptoms

  • Check Engine Light Is On
  • Reduced engine power
  • Increased fuel consumption
  • Unstable engine idling
  • Emission Control System Errors

Causes

  • Open or short circuit in the heater grounding circuit
  • Damaged NOx sensor wiring harness
  • Malfunction of the NOx sensor itself
  • Poor contact in the sensor connector
  • Problems with the engine control unit (ECU)

How to Fix

  1. Check the integrity of the heater grounding circuit
  2. Inspect the wiring harness and sensor connector for damage.
  3. Check NOx sensor heater resistance
  4. If necessary, replace the NOx sensor
  5. Check and clean ground terminals

Related codes

P11C4P11C6P2200

FAQ

What does the P11C5 code mean?

P11C5 is an OBD-II diagnostic trouble code that indicates: NOx Sensor 1 Heater Ground Circuit

What causes a P11C5 error code?

The most common causes of P11C5 include: Open or short circuit in the heater grounding circuit; Damaged NOx sensor wiring harness; Malfunction of the NOx sensor itself; Poor contact in the sensor connector.

How do I fix a P11C5 diagnostic trouble code?

To fix P11C5: Check the integrity of the heater grounding circuit. Inspect the wiring harness and sensor connector for damage.. Check NOx sensor heater resistance. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with P11C5?

Yes, but get it checked soon

How much does it cost to fix P11C5?

The estimated repair cost for P11C5 is $167–333. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat