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P2204
System
Powertrain (Diesel Emissions)
Benötigter Scanner
Full-system scanner (engine, ABS, SRS, transmission, service resets)

NOx Sensor Circuit Low Input (Bank 2 Sensor 1)

Understand P2204, common causes, and the right TOPDON scanner to diagnose it.

Bank 2 upstream NOx sensor circuit low.

Häufige Symptome

  • SCR codes
  • Check engine light

Typische Ursachen

  • Failed bank 2 NOx sensor
  • Wiring short
  • Exhaust leak affecting sensor

Welchen Scanner brauchen Sie?

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

Nutzen Sie Live-Daten und Freeze Frame, bevor Sie Teile tauschen. ABS-, SRS- und U-Codes erfordern meist einen Vollsystem-Scanner.

Diagnose-Tipps

  • Freeze Frame erfassen, wenn der Code erstmals gesetzt wird
  • Code erst nach Behebung der Ursache löschen
  • Auf verwandte pending codes prüfen
  • Batteriespannung über 12,4 V prüfen, bevor Sie Sensoren verdächtigen

Empfohlene TOPDON Scanner

Häufig gestellte Fragen

What does P2204 mean?
P2204 indicates nox sensor circuit low input (bank 2 sensor 1). Bank 2 upstream NOx sensor circuit low.
Can I diagnose P2204 with a basic code reader?
P2204 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 P2204?
Full-system scanner (engine, ABS, SRS, transmission, service resets) See recommended tools on this page.
Is it safe to drive with P2204?
It depends on the code and symptoms. Flashing check engine lights and misfire codes should be addressed immediately. Consult a professional if unsure.