Code result
P22AA
NOx Sensor Heater Sense Circuit Intermittent
High severity
What it means
The feedback line that monitors the NOx sensor heater current draw on bank 1 sensor 2 jumps or drops out intermittently — connector loose or chafed wire near the exhaust heat zone.
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
Intermittent connector
highOne of the most commonly reported causes for this code — check this first.
Connector with intermittent contact under vibration
lowLess common, but worth ruling out after the more likely causes.
Harness routed against vibrating component
lowLess common, but worth ruling out after the more likely causes.
Related help
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