P225F

What it means

The NOx sensor on bank 1 sensor 2 reads suspiciously low for too long — biased downward or stuck. Common after sensor element ageing, condensate damage from cold start, or wiring fault that pulls the signal down.

Is it safe to drive?

This code points to a problem that can cause damage or affect safety. Avoid driving and have the vehicle diagnosed promptly.

Most likely causes

• Sensor aged

  high

  One of the most commonly reported causes for this code — check this first.

• Sensor element aged beyond calibration window

  low

  Less common, but worth ruling out after the more likely causes.

• Sensor element contaminated by oil, soot or coolant

  low

  Less common, but worth ruling out after the more likely causes.

Related help

• Full P225F diagnosis, causes & costs
• How to read check engine light codes
• Is it safe to drive with the light on?