P2210: NOx Sensor Heater Sense Circuit Low Bank 1 Sensor 1
What to do
The car drives normally. Ask for the harness to be inspected where it passes brackets and edges, and for the connector to be opened and checked for moisture — this is a low-current measurement wire, so damage and corrosion account for most of these rather than a failed sensor.
What this code means
The heater sense circuit reads below its valid range, normally a short to ground in the sense line or in the sensor's internal connection to it.
Because the sense line carries almost no current, a short here is more often external damage than internal failure — chafing where the harness passes a bracket or an edge, or water bridging corroded terminals in the connector. The distinction from the control-circuit low code at P2206 is worth keeping clear: that one is a driven output being shorted, which the module protects itself against by shutting down; this one is a measurement path, and the module simply loses a reading it cannot use.
Likely causes
Start here
- Wiring shorted to ground · moderate
- Water ingress into connector · easy
- Damaged wiring harness · moderate
Less common
- Faulty NOx sensor · moderate
Symptoms
Components involved
Information, not instruction
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Have anything you intend to act on checked by a trained person against the manufacturer's own procedure for your vehicle. Nothing here replaces that procedure.
Community experience
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