Code result
P2209
NOx Sensor Heater Sense Circuit Range/Performance
High severity
What it means
The heater feedback (sense) line on the bank 2 NOx sensor reports values outside the expected window — heating is happening but the temperature does not match the model.
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
Heater element ageing, resistance drift
highOne of the most commonly reported causes for this code — check this first.
Sensor module failed
mediumA plausible cause — test and verify before replacing parts.
Sensor element aged beyond calibration window
lowLess common, but worth ruling out after the more likely causes.
Related help
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