OBD Guide
ENFRDEESPT

P116B

O2 Signal Circuit Low Voltage (NOx Sensor 1)

P116B is an OBD-II diagnostic trouble code meaning: O2 Signal Circuit Low Voltage (NOx Sensor 1). Common causes: open or short circuit in the nox sensor circuit, nox sensor 1 malfunction. 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
  • Reduced engine power
  • Increased fuel consumption
  • Unstable engine idling
  • Dips during acceleration

Causes

  • Open or short circuit in the NOx sensor circuit
  • NOx sensor 1 malfunction
  • Connector problems or contact corrosion
  • Malfunction of the electronic control unit (ECU)
  • Wiring harness damage

How to Fix

  1. Check the continuity of the NOx sensor circuit
  2. Inspect connectors and contacts for corrosion or damage
  3. Check the resistance and voltage at the sensor
  4. If necessary, replace NOx sensor 1
  5. Check and, if necessary, reflash the ECU

Related codes

P116AP116CP116D

FAQ

What does the P116B code mean?

P116B is an OBD-II diagnostic trouble code that indicates: O2 Signal Circuit Low Voltage (NOx Sensor 1)

What causes a P116B error code?

The most common causes of P116B include: Open or short circuit in the NOx sensor circuit; NOx sensor 1 malfunction; Connector problems or contact corrosion; Malfunction of the electronic control unit (ECU).

How do I fix a P116B diagnostic trouble code?

To fix P116B: Check the continuity of the NOx sensor circuit. Inspect connectors and contacts for corrosion or damage. Check the resistance and voltage at the sensor. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with P116B?

Yes, but get it checked soon

How much does it cost to fix P116B?

The estimated repair cost for P116B is $56–167. Actual cost depends on your vehicle, location, and labor rates.

FRDEESPT

See also: Russian version · NationStat