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P0155
System
Powertrain (Emissions)
Scanner som krävs
Basic OBD2 code reader (engine codes, live data, smog readiness)

O2 Sensor Heater Circuit (Bank 2 Sensor 1)

Understand P0155, common causes, and the right TOPDON scanner to diagnose it.

Heater circuit for bank 2 upstream O2 sensor. Common high-mileage failure on V-engines.

Vanliga symptom

  • Check engine light
  • I/M readiness monitor not ready

Typiska orsaker

  • Failed O2 sensor
  • Heater fuse
  • Connector corrosion

Vilken scanner behöver du?

Basic OBD2 code reader (engine codes, live data, smog readiness)

Använd live-data och freeze frame innan du byter delar. ABS-, SRS- och U-koder kräver oftast en fullsystems-scanner.

Diagnostiktips

  • Spara freeze frame när koden först sätts
  • Rensa koden först efter att orsaken är åtgärdad
  • Kontrollera relaterade väntande koder
  • Verifiera batterispänning över 12,4 V innan du misstänker sensorer

Rekommenderade TOPDON-scannrar

Vanliga frågor

What does P0155 mean?
P0155 indicates o2 sensor heater circuit (bank 2 sensor 1). Heater circuit for bank 2 upstream O2 sensor. Common high-mileage failure on V-engines.
Can I diagnose P0155 with a basic code reader?
Yes — P0155 is typically accessible with a basic OBD2 code reader like the TOPDON ArtiDiag201 or TopScan Lite. Live data helps confirm the repair.
Which TOPDON scanner do I need for P0155?
Basic OBD2 code reader (engine codes, live data, smog readiness) See recommended tools on this page.
Is it safe to drive with P0155?
It depends on the code and symptoms. Flashing check engine lights and misfire codes should be addressed immediately. Consult a professional if unsure.