2003 BMW 325i

2003 BMW 325i

Overview

The 2003 BMW 325i, part of the E46 generation, is generally regarded as a solid vehicle with a good balance of performance and luxury. However, like any vehicle of this age, it has specific areas that have shown a propensity for issues over time. This data focuses on common mechanical and electrical problems reported by owners and technicians, excluding routine maintenance. Understanding these potential pitfalls can help owners budget for and address repairs proactively, ensuring the continued enjoyment of this sporty sedan.

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Engine

M54B25 (2.5L Inline-6)

Oil Leaks (Valve Cover Gasket, Oil Pan Gasket)

• Symptoms: Visible oil stains under the car, burning oil smell, low oil level.
• Solution: Replacement of the leaking gasket(s).
• Cost: $300 - $700

Cooling System Failures (Water Pump, Thermostat, Expansion Tank)

• Symptoms: Overheating, coolant leaks, heater not working.
• Solution: Replacement of failed cooling system components.
• Cost: $400 - $900

PCV System Clog

• Symptoms: Rough idle, oil consumption, whistling noise from the valve cover area.
• Solution: Replacement of the Positive Crankcase Ventilation (PCV) valve and associated hoses.
• Cost: $200 - $500

Transmission

5-Speed Manual (Getrag S5D 320Z)

No Major Issues

• Symptoms: No widespread issues reported.
• Solution: No widespread issues reported.
• Cost: No widespread issues reported.

5-Speed Automatic (GM A5S 325Z)

Transmission Fluid Leaks

• Symptoms: Leaking fluid from transmission pan or cooler lines, rough shifting.
• Solution: Repair or replacement of leaking seals, lines, or pan gasket.
• Cost: $300 - $800

Torque Converter Issues

• Symptoms: Shuddering at low speeds, slipping, delayed engagement.
• Solution: Replacement of the torque converter.
• Cost: $800 - $1500

Suspension

Standard Chassis

Control Arm Bushings

• Symptoms: Clunking noises over bumps, vague steering feel, uneven tire wear.
• Solution: Replacement of worn control arm bushings or entire control arms.
• Cost: $400 - $800

Rear Shock Mounts

• Symptoms: Clunking or rattling noises from the rear suspension, especially over uneven surfaces.
• Solution: Replacement of the rear shock mounts.
• Cost: $200 - $400

Electrical

General Electrical System

ABS/DSC Module Failure

• Symptoms: ABS and/or DSC warning lights illuminated on the dashboard, loss of ABS/DSC function.
• Solution: Repair or replacement of the ABS/DSC control module.
• Cost: $600 - $1200

Window Regulator Failure

• Symptoms: Power windows not operating, window getting stuck.
• Solution: Replacement of the window regulator mechanism.
• Cost: $200 - $400

Instrument Cluster Issues

• Symptoms: Flickering gauges, dead pixels on the display, intermittent power loss to the cluster.
• Solution: Repair or replacement of the instrument cluster.
• Cost: $400 - $900

Exterior

Body and Trim

Headlight Lens Hazing/Yellowing

• Symptoms: Reduced headlight output, unsightly appearance.
• Solution: Restoration of headlight lenses or replacement.
• Cost: $50 - $200

Sunroof Drain Clogs

• Symptoms: Water leaks into the cabin, musty smell.
• Solution: Clearing of sunroof drain tubes.
• Cost: $100 - $250

Interior

Cabin Components

HVAC Blower Motor Resistor Failure

• Symptoms: Fan only works on highest setting or not at all.
• Solution: Replacement of the blower motor resistor.
• Cost: $100 - $250

Pixelated LCD Displays ( OBC/Radio)

• Symptoms: Missing or garbled text/pixels on the onboard computer or radio display.
• Solution: Repair or replacement of the display unit.
• Cost: $200 - $500

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Summary Verdict

The 2003 BMW 325i (E46) is a desirable car, but its age means certain components are prone to failure. Common issues revolve around oil leaks from the engine, cooling system components, and the PCV system. Automatic transmissions can develop leaks or torque converter problems. Suspension components like control arm bushings and shock mounts are also wear items. Electrically, ABS/DSC modules, window regulators, and instrument clusters are known to fail. While the manual transmission is generally robust, the automatic requires more attention. Proactive maintenance and addressing these known issues can significantly improve the long-term reliability and ownership experience of this classic BMW.