2007 BMW 120i

2007 BMW 120i

Overview

The 2007 BMW 120i, part of the E87 generation, is generally considered a solid vehicle, offering a blend of sporty driving dynamics and premium interior appointments. As with any vehicle of this age, certain components may exhibit wear, but widespread critical failures are not commonly reported. This analysis focuses on documented technical reliability concerns beyond routine maintenance, providing insights into potential areas of attention for owners and prospective buyers. The 120i typically came equipped with a naturally aspirated four-cylinder petrol engine and a choice of manual or automatic transmissions, both of which have their own reliability profiles.

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Engine

2.0L N46B20 (Petrol)

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 affected gasket.
• Cost: $300 - $700

PCV Valve Failure

• Symptoms: Rough idle, increased oil consumption, whistling noise from the engine bay.
• Solution: Replacement of the PCV valve assembly.
• Cost: $200 - $400

Coolant Leaks (Water Pump, Thermostat Housing)

• Symptoms: Overheating, coolant level dropping, visible coolant residue.
• Solution: Replacement of the faulty component (water pump or thermostat housing).
• Cost: $400 - $800

Transmission

6-Speed Manual (GS6-37BZ)

Clutch Wear

• Symptoms: Slipping clutch, difficulty engaging gears, burning smell.
• Solution: Clutch kit replacement (clutch disc, pressure plate, release bearing).
• Cost: $800 - $1500

6-Speed Automatic (GA6HP19Z)

Mechatronic Unit Issues

• Symptoms: Harsh shifting, transmission warning light, failure to engage gears.
• Solution: Repair or replacement of the mechatronic unit.
• Cost: $1500 - $3000

Torque Converter Problems

• Symptoms: Shuddering at low speeds, slipping, delayed engagement.
• Solution: Replacement of the torque converter.
• Cost: $1000 - $2000

Suspension

Standard Chassis

Worn Control Arm Bushings

• Symptoms: Clunking noises over bumps, vague steering feel, uneven tire wear.
• Solution: Replacement of control arm bushings or the entire control arm assembly.
• Cost: $400 - $700

Shock Absorber/Strut Failure

• Symptoms: Bouncy ride, reduced handling, visible leaks from shocks.
• Solution: Replacement of shock absorbers or struts.
• Cost: $500 - $900

Electrical

General Electrical System

Window Regulator Failure

• Symptoms: Power windows not operating, window getting stuck.
• Solution: Replacement of the window regulator mechanism.
• Cost: $250 - $500

ABS/DSC Sensor Issues

• Symptoms: ABS or DSC warning lights illuminated, loss of ABS/DSC function.
• Solution: Replacement of the faulty ABS wheel speed sensor.
• Cost: $200 - $400

Exterior

Body Panels & Trim

No widespread issues reported.

• Symptoms: N/A
• Solution: N/A
• Cost: Varies

Interior

Cabin Electronics & Trim

No widespread issues reported.

• Symptoms: N/A
• Solution: N/A
• Cost: Varies

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Summary Verdict

The 2007 BMW 120i (E87) demonstrates reasonable reliability for its age and class. The most common concerns revolve around the naturally aspirated 2.0L N46 engine, particularly oil leaks and PCV valve issues, which are not uncommon for BMW engines of this era. Transmission reliability is generally good, though automatic transmissions can develop issues with the mechatronic unit or torque converter over time. Suspension components like control arm bushings and shocks are typical wear items that may require attention. Electrical gremlins are usually minor, such as window regulators or ABS sensors. Overall, with diligent maintenance and addressing potential leaks or worn suspension parts, the 120i can remain a dependable and enjoyable vehicle.