P2225: NOx Sensor Heater Sense Circuit Intermittent Bank 2
What to do
The car drives normally. Note whether the fault appears only once warm or after a certain distance, and ask for the connector and harness to be inspected rather than the sensor replaced on suspicion.
What this code means
The bank 2 heater sense reading jumps or drops out rather than changing smoothly. A heated ceramic element has real thermal mass and cannot change temperature abruptly, so any step the module sees is electrical — and on a low-current measurement line underneath the vehicle, that means a connection. See P2212.
Likely causes
Start here
- Corroded or loose connector · easy
- Intermittent wiring fault · moderate
- Water ingress into connector · easy
Less common
- Faulty NOx sensor · 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
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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.
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