P2106 Fault Code in 2004 Ford F-15-0 5.4L with Engine Fail-Safe Mode and ABS Activation After Car Wash
After replacing both the engine and transmission in my 2004 Ford F-150 Lariat 5.4L (VIN 5), I am now encountering a P2106 diagnostic code, which triggers engine fail-safe mode. The vehicle runs with noticeable misfire symptoms, though no additional misfire-related codes are detected. I recently cleaned the throttle body, but the issue persists. Additionally, after passing through a car wash, the ABS light activated unexpectedly. I am seeking advice on how to diagnose and resolve both the P2106 code and the sudden ABS activation. The 5.4L engine is known for certain electronic issues post-rebuild, so any insight into potential sensor or ECU-related causes would be greatly appreciated.
If no other P-codes are present, focus first on diagnosing the ABS issue. Ensure that the car wash did not involve direct contact with the engine or undercarriage—washing the exterior only may have triggered a sensor misread. Check for water ingress into the wheel speed sensors or wiring harnesses, as moisture can cause false ABS activation in older F-150 models.