P2220: NOx Sensor Heater Control Circuit High Bank 2
What to do
The car drives normally and the countdown applies. If heater faults are stored for more than one sensor at once, mention it — a shared fuse or supply is far more likely than two of the most expensive sensors on the vehicle failing together.
What this code means
The bank 2 heater control circuit reads above its valid range — an open circuit, a short to supply, or a heater element that has failed open, which is the ordinary end-of-life failure for this part.
The supply check comes first, for the reason given at P2207: a blown fuse or failed supply feeding more than one heater produces identical codes on several sensors at once, and that is a shared fault rather than several failed sensors.
Likely causes
Start here
- Open circuit in heater wiring · moderate
- Faulty NOx sensor · moderate
- Blown fuse or failed supply · easy
- 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 P2220.