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P2224
System
Powertrain (Diesel Emissions)
Scanner required
Full-system scanner (engine, ABS, SRS, transmission, service resets)

NOx Sensor Performance (Bank 2 Sensor 1)

Understand P2224, common causes, and the right TOPDON scanner to diagnose it.

Bank 2 upstream NOx sensor performance out of spec.

Common symptoms

  • P20EE may accompany
  • SCR warning

Typical causes

  • Failed NOx sensor
  • SCR catalyst degraded
  • DEF not injecting properly

What scanner do you need?

Full-system scanner (engine, ABS, SRS, transmission, service resets)

Use live data and freeze frame to confirm the fault before replacing parts. ABS, SRS, and network U-codes usually require a full-system scanner.

Diagnostic tips

  • Record freeze frame data when the code first sets
  • Clear the code only after fixing the root cause
  • Check for related pending codes that point to a common issue
  • Verify battery voltage is above 12.4V before chasing sensor codes

Recommended TOPDON scanners

Frequently asked questions

What does P2224 mean?
P2224 indicates nox sensor performance (bank 2 sensor 1). Bank 2 upstream NOx sensor performance out of spec.
Can I diagnose P2224 with a basic code reader?
P2224 may set in the engine module, but related diagnostics often benefit from an enhanced or full-system scanner with live data and freeze frame.
Which TOPDON scanner do I need for P2224?
Full-system scanner (engine, ABS, SRS, transmission, service resets) See recommended tools on this page.
Is it safe to drive with P2224?
It depends on the code and symptoms. Flashing check engine lights and misfire codes should be addressed immediately. Consult a professional if unsure.