2022-2023 BMW EVAP Micro-Leak Fault Code 190302

BMW has released a manufacturer communication, NHTSA ID 10239602, addressing a specific issue related to the fuel evaporative (EVAP) system. This technical service bulletin (TSB) focuses on diagnosing and resolving micro-leaks within this system, which can trigger a diagnostic trouble code in the Digital Motor Electronics (DME) unit.

The document highlights that vehicles may present with a BMW X5 EVAP micro-leak condition, indicating a problem with the fuel tank ventilation and scavenging air system. This is a crucial component for emissions control, preventing fuel vapors from escaping into the atmosphere.

Symptoms

Owners of affected 2022-2023 BMW vehicles might notice an illuminated check engine light or other warning indicators on their dashboard. The underlying cause is a micro-leak in the fuel evaporative (EVAP) system, which the vehicle's diagnostic system detects.

Fault Codes / DTCs

When a micro-leak is present, the vehicle's Digital Motor Electronics (DME) system will store a specific fault code:

This fault code, 190302, precisely identifies the nature of the problem: a leakage in the EVAP system exceeding a specified threshold.

Diagnosis / Trigger Conditions

The system responsible for detecting this issue is the Natural Vacuum Leak Detection (NVLD) system, part of the overall EVAP system. The NVLD system continuously monitors the fuel tank's integrity for leaks. If it detects a leakage greater than 0.5 mm, it will trigger the fault code 190302.

When a vehicle arrives for diagnosis with a BMW X5 EVAP micro-leak and the fault code 190302, technicians will investigate the fuel tank ventilation and scavenging air system. The manufacturer communication NHTSA ID 10239602 provides guidance for addressing this specific condition.

Repair Procedure Summary

While the manufacturer communication does not detail the specific repair steps, it indicates that the TSB is intended to guide technicians in diagnosing and resolving the