OBD Guide

P225F

NOx Sensor Performance - Signal Biased/Stuck Low Bank 1 Sensor 2

Severity
⚠️ Medium
Can you drive?
Yes, but get it checked soon
Approx. repair cost
$167–444 (est.)

Symptoms

  • Increased fuel consumption
  • Reduced engine power
  • Check Engine light comes on
  • Increased level of harmful emissions
  • Problems with passing technical inspection

Causes

  • NOx sensor malfunction
  • Damage to wiring or connectors
  • Problems with the engine control unit
  • NOx sensor contamination
  • AdBlue injection system malfunction

How to Fix

  1. Check the condition of the NOx sensor and its connectors
  2. Check the integrity of the wiring to the sensor
  3. Check the operation of the AdBlue injection system
  4. Clean or replace NOx sensor if necessary
  5. Reset the error code and check if it returns

Related codes

Error P225F by Vehicle Brand