P2217: NOx Sensor Circuit Intermittent Input Bank 2
What to do
Note whether it happens once the vehicle is warm or after a certain distance — that points at a connection opening as it heats up, which will not show itself on a cold car in a workshop. Ask for the connector and harness to be inspected before the sensor is replaced.
What this code means
The bank 2 NOx sensor signal drops out or jumps rather than varying smoothly. The environment that causes most of these — an exhaust-mounted connector heat-cycled and salt-sprayed on every journey — and the wire that breaks inside intact insulation are described at P2204.
Because these sensors communicate digitally, an intermittent fault typically shows as the sensor disappearing from the bus and returning rather than as a noisy reading, which points at the connection rather than the element.
Likely causes
Start here
- Corroded or loose connector · easy
- Intermittent wiring fault · moderate
- Water ingress into connector · easy
Less common
- Damaged wiring harness · moderate
- 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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