P2216: NOx Sensor Circuit High Input Bank 2
What to do
The car drives normally and the countdown applies. If work has recently been done underneath the vehicle, ask for the sensor connector to be checked first — a plug not fully seated gives exactly this code.
What this code means
The bank 2 NOx sensor reads above its valid range — an open circuit, a short to supply, or a figure beyond anything an engine could physically emit. The reasoning and the ambiguity are at P2203.
The practical first check is the same: an open circuit is what a disconnected sensor looks like, and these connectors are underneath the vehicle where exhaust and suspension work regularly disturbs them.
Likely causes
Start here
- Open circuit in sensor wiring · moderate
- Disconnected sensor connector · easy
- Faulty NOx sensor · moderate
- Corroded or loose connector · easy
Less common
- Wiring shorted to voltage · moderate
Symptoms
Components involved
Information, not instruction
CarGeek is a reference, not a service manual. Its pages are written from public sources and from what other people have found, never from a manufacturer's own service information, so they can be wrong or incomplete for your particular vehicle. Some of what they describe carries real risk: high voltage, fuel under pressure, stored energy, hot and moving parts.
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
Be the first to write this up
Nothing posted about this yet. Whatever you found is worth writing down — even a dead end saves someone the same afternoon.
What makes one worth reading:
- The car — make, model, year and engine. The same fault behaves differently on each.
- What you measured, not only what you replaced.
- What actually fixed it — or that nothing did, which is worth knowing too.
Sign in or create an account to add what you found about P2216.