P0155 on Volvo EX90
Factory diagnostic protocol and troubleshooting wire for fault code P0155 specifically for the Volvo EX90 (2024–2026, Twin Motor AWD EV (402HP / Performance 510HP / 111 kWh)).
1. Symptoms of P0155 on Volvo EX90
When the Engine Control Module (ECM/PCM) on your Volvo EX90 (Twin Motor AWD EV (402HP / Performance 510HP / 111 kWh)) logs fault code P0155, drivers commonly observe:
2. Most Likely Causes on Volvo EX90
Historical warranty claims and technical repair bulletins for Volvo EX90 point to the following failure distribution:
3. Step-by-Step DIY Repair Guide for Volvo EX90
Inspect the O2 HTR fuse in the engine fuse box with a test light or multimeter. on the Volvo EX90 equipped with Twin Motor AWD EV (402HP / Performance 510HP / 111 kWh).
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 Volvo EX90 equipped with Twin Motor AWD EV (402HP / Performance 510HP / 111 kWh).
Remove faulty sensor and install a new OEM oxygen sensor with built-in heater. on the Volvo EX90 equipped with Twin Motor AWD EV (402HP / Performance 510HP / 111 kWh).
Clear DTCs and allow engine to cool down, then restart to confirm P0155 does not return. on the Volvo EX90 equipped with Twin Motor AWD EV (402HP / Performance 510HP / 111 kWh).
Equipment for Diagnosing Volvo EX90 (P0155)
Volvo EX90 OEM Replacement Sensor
Direct-fit replacement assembly engineered to OEM tolerances for Volvo EX90.
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 Volvo EX90
Frequently diagnosed powertrain, emissions, and sensor trouble codes logged on the Volvo EX90:
4. Volvo EX90 P0155 FAQs
What causes code P0155 to trigger on a Volvo EX90?
On the Volvo EX90 (Twin Motor AWD EV (402HP / Performance 510HP / 111 kWh)), 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 Volvo EX90?
On the Volvo EX90, the 16-pin DLC diagnostic connector is located Driver footwell lower OBD interface. Plug in any standard OBD-II scanner with the ignition in the ON position to read freeze-frame parameters.
Can I safely drive my Volvo EX90 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.