P0155 on Toyota Crown
Factory diagnostic protocol and troubleshooting wire for fault code P0155 specifically for the Toyota Crown (2023–2026, 2.4L Turbo Hybrid MAX (340HP) / 2.5L THS II Hybrid AWD).
1. Symptoms of P0155 on Toyota Crown
When the Engine Control Module (ECM/PCM) on your Toyota Crown (2.4L Turbo Hybrid MAX (340HP) / 2.5L THS II Hybrid AWD) logs fault code P0155, drivers commonly observe:
2. Most Likely Causes on Toyota Crown
Historical warranty claims and technical repair bulletins for Toyota Crown point to the following failure distribution:
3. Step-by-Step DIY Repair Guide for Toyota Crown
Inspect the O2 HTR fuse in the engine fuse box with a test light or multimeter. on the Toyota Crown equipped with 2.4L Turbo Hybrid MAX (340HP) / 2.5L THS II Hybrid AWD.
Unplug the sensor connector and measure resistance between the two heater pins. An open circuit (infinite ohms / OL) confirms a dead internal heater. on the Toyota Crown equipped with 2.4L Turbo Hybrid MAX (340HP) / 2.5L THS II Hybrid AWD.
Remove faulty sensor and install a new OEM oxygen sensor with built-in heater. on the Toyota Crown equipped with 2.4L Turbo Hybrid MAX (340HP) / 2.5L THS II Hybrid AWD.
Clear DTCs and allow engine to cool down, then restart to confirm P0155 does not return. on the Toyota Crown equipped with 2.4L Turbo Hybrid MAX (340HP) / 2.5L THS II Hybrid AWD.
Equipment for Diagnosing Toyota Crown (P0155)
Toyota Crown OEM Replacement Sensor
Direct-fit replacement assembly engineered to OEM tolerances for Toyota Crown.
AstroAI Auto-Ranging Digital Multimeter
Essential for testing 0.1V–5.0V sensor reference signals, ground continuity (<0.20Ω), and harness resistance.
BlueDriver Bluetooth Pro OBDII Scan Tool
Reads and clears enhanced codes (ABS, Airbag, Transmission, Engine) & live freeze-frame telemetry on phone.
Other Common Fault Codes on Toyota Crown
Frequently diagnosed powertrain, emissions, and sensor trouble codes logged on the Toyota Crown:
4. Toyota Crown P0155 FAQs
What causes code P0155 to trigger on a Toyota Crown?
On the Toyota Crown (2.4L Turbo Hybrid MAX (340HP) / 2.5L THS II Hybrid AWD), P0155 is most frequently caused by Burnt-out heating element inside the Bank 2 Sensor 1 O2 sensor or Blown O2 heater fuse in under-hood fuse block.
Where is the OBD-II port located on my Toyota Crown?
On the Toyota Crown, the 16-pin DLC diagnostic connector is located Driver lower footwell beneath OBD protective lip. Plug in any standard OBD-II scanner with the ignition in the ON position to read freeze-frame parameters.
Can I safely drive my Toyota Crown with code P0155?
Yes. The sensor will take longer to warm up, causing brief open-loop fuel delay on cold starts. Given that P0155 carries a Medium severity rating, we advise avoiding heavy towing or aggressive throttle inputs until sensor readings are verified.