P2225

NOx Sensor Heater Sense Circuit Intermittent Bank 2

Q: Is it safe to drive with P2225?

For normal driving, generally yes. It's an intermittent emissions fault, though on SCR-equipped diesels repeated NOx faults can trigger a reduced-power derate, so don't ignore it.

Q: Can I just clear P2225?

It will reappear whenever the intermittent connection acts up again. Because it comes and goes, focus on connectors and wiring rather than just clearing the code.

NOx sensor / emissions Generic OBD-II Medium

What it means

P2225 means the PCM saw an intermittent or erratic signal on the heater-sense circuit of the bank 2 NOx sensor. This circuit lets the computer confirm the sensor's heater is working so it can measure nitrogen-oxide levels. Because the fault is intermittent and emissions-related, the engine usually drives normally and the light may come and go. The most common cause of an intermittent code is a loose or corroded connector or chafed wiring rather than a fully failed part.

Medium

Can I keep driving? Drivable — an intermittent emissions fault, but on some diesels repeated NOx faults can lead to a speed-limiting derate, so track it down before it worsens.

Real-world scan data

Seen in

scans in the past year

Found in

<0.1%

of scans

<0.1%

of scans that found faults

Figures reflect only diagnostic scans recorded through our own apps and tools. Cars are typically scanned because a symptom or warning light prompted it, so these counts describe our scan records — not the incidence of faults in any model, and not the quality, reliability, or safety of any vehicle. No comparison between manufacturers or models is implied. All trademarks belong to their respective owners; no affiliation or endorsement is implied.

Common symptoms

What you'll notice

Check-engine light on, sometimes coming and going
Often no noticeable change in how the car drives
Failed or incomplete emissions readiness
Possible DEF/SCR warning on diesel applications

Common causes

Most likely first

Loose or corroded connector at the bank 2 NOx sensor (most common with intermittent faults)Likely
Chafed or intermittently shorting heater-sense wiringCommon
Poor ground for the NOx sensorCommon
Faulty NOx sensor (internal heater-sense fault)Less often

How to diagnose & fix

Work through it in order

Read freeze-frame data to capture the conditions when the fault appears.
Wiggle-test the NOx sensor connector and harness while watching live data — intermittent codes usually trace to a connection that breaks under vibration or heat.
Inspect the harness for chafing or heat damage near the exhaust.
Verify a clean ground for the sensor.
Replace the NOx sensor if the heater-sense fault is internal. Clear and re-test.

FAQ

Quick answers

Is it safe to drive with P2225?+

For normal driving, generally yes. It's an intermittent emissions fault, though on SCR-equipped diesels repeated NOx faults can trigger a reduced-power derate, so don't ignore it.

Can I just clear P2225?+

It will reappear whenever the intermittent connection acts up again. Because it comes and goes, focus on connectors and wiring rather than just clearing the code.

Read & clear P2225 yourself

Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.

▶ Get it on Google Play

✓ Verified name — SAE J2012 / ISO 15031-6Guidance reviewed by OBD DashX