U0104 on BMW M3
Factory diagnostic protocol and troubleshooting wire for fault code U0104 specifically for the BMW M3 (2021–2026, 3.0L High-Revving Twin-Turbo Inline-6 (S58 473HP–523HP Competition)).
1. Symptoms of U0104 on BMW M3
When the Engine Control Module (ECM/PCM) on your BMW M3 (3.0L High-Revving Twin-Turbo Inline-6 (S58 473HP–523HP Competition)) logs fault code U0104, drivers commonly observe:
2. Most Likely Causes on BMW M3
Historical warranty claims and technical repair bulletins for BMW M3 point to the following failure distribution:
3. Step-by-Step DIY Repair Guide for BMW M3
Clean snow, ice, mud, or dead bugs off front radar emblem. on the BMW M3 equipped with 3.0L High-Revving Twin-Turbo Inline-6 (S58 473HP–523HP Competition).
Verify power feed to radar sensor. on the BMW M3 equipped with 3.0L High-Revving Twin-Turbo Inline-6 (S58 473HP–523HP Competition).
Execute optical/radar alignment procedure if bumper was removed. on the BMW M3 equipped with 3.0L High-Revving Twin-Turbo Inline-6 (S58 473HP–523HP Competition).
Clear DTCs and test cruise on highway. on the BMW M3 equipped with 3.0L High-Revving Twin-Turbo Inline-6 (S58 473HP–523HP Competition).
Equipment for Diagnosing BMW M3 (U0104)
BMW M3 OEM Replacement Sensor
Direct-fit replacement assembly engineered to OEM tolerances for BMW M3.
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 BMW M3
Frequently diagnosed powertrain, emissions, and sensor trouble codes logged on the BMW M3:
4. BMW M3 U0104 FAQs
What causes code U0104 to trigger on a BMW M3?
On the BMW M3 (3.0L High-Revving Twin-Turbo Inline-6 (S58 473HP–523HP Competition)), U0104 is most frequently caused by Blocked or dirty front radar sensor in grille/bumper or Blown radar module fuse.
Where is the OBD-II port located on my BMW M3?
On the BMW M3, the 16-pin DLC diagnostic connector is located Driver A-pillar base kick panel behind spring-loaded door. Plug in any standard OBD-II scanner with the ignition in the ON position to read freeze-frame parameters.
Can I safely drive my BMW M3 with code U0104?
Yes. Normal driving is unaffected, but Adaptive Cruise Control will not engage. Given that U0104 carries a Low severity rating, we advise avoiding heavy towing or aggressive throttle inputs until sensor readings are verified.