Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSBMW1999328I 2D CONVERTIBLE, AUTOMATICREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCETESTING & DIAGNOSISENGINE CONTROL - OVERVIEWMS41.1/MS41.2EMISSIONS MANAGEMENT-TRANSITIONAL LOW EMISSION VEHICLE (TLEV) COMPLIANTPRINCIPLE OF OPERATIONOBD II DRIVE CYCLE & TRIP
1999 BMW 328i 2D Convertible, Automatic
OBD II Drive Cycle & Trip
1999 BMW 328i 2D Convertible, AutomaticSECTION OBD II Drive Cycle & Trip
- A "Drive Cycle" consists of engine startup and engine shutoff.
- "Trip" is determined as vehicle operation (follow an engine-off period) of duration and driving style so that all components and systems are monitored at least once by the diagnostic system except catalyst efficiency or evaporative system monitoring.
- Within this text the term "customer driving cycle" will be used and is defined as engine start-up, operation of vehicle (dependent upon customer drive style) and engine shut-off.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.