Code result
P225E
NOx Sensor Performance - Signal Biased/Stuck High
High severity
What it means
The NOx sensor on bank 1 sensor 2 reads suspiciously high for too long — biased upward or stuck. Common after sensor poisoning by silicon, sulphur, or oil ash.
Is it safe to drive?
No — stop driving
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 poisoned
highOne of the most commonly reported causes for this code — check this first.
Sensor element aged beyond calibration window
lowLess common, but worth ruling out after the more likely causes.
Sensor element contaminated by oil, soot or coolant
lowLess common, but worth ruling out after the more likely causes.
Related help
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