BMW 4 Series (G22/G23/G26): Buyer’s and Owner’s Guide
Summary. The BMW 4 Series in G22 (coupe), G23 (convertible), and G26 (Gran Coupe) form is a sporting D-segment machine built on the G20 platform. The strengths: precise handling and the reliable B58 engine. The weak spots: firm M Sport suspension, expensive laser headlights, and the convertible’s trouble-prone roof mechanism. The main advice: inspect the suspension and the roof before you buy, follow the service schedule, and the car will cover 124,000+ miles without major outlays.
The Problem
You climb into a BMW 4 Series with 50,000 miles on it—and hear clunks from the front suspension over every bump. A month later, a laser headlight goes dark, and the dealer quotes a figure comparable to a full rebuild. Sound familiar? The G22/G23/G26 pairs premium comfort with a sporting character, but it demands attentive maintenance. Here’s where the 4 Series is weak—and how to dodge the expensive surprises.
Symptoms
- Clunks from the front suspension over bumps
- Harshness on broken pavement
- Glitches in the infotainment gesture control
- Creaks and rattles from the convertible’s body
- Wear on the driver’s seat bolsters
- Harsh automatic transmission shifts (when services have been skipped)
Causes
Suspension. M Sport firmness is deliberate: the car turns in sharper, but ride comfort on bad pavement suffers. Adaptive dampers fix that, yet they fail after 50,000 miles, and replacement is expensive. Control arm bushings wear out between 43,000 and 56,000 miles—normal for the model given the stiff tuning.
Convertible body. The soft top leaves the body less rigid than the coupe’s—hence the creaks. The folding mechanism is complex, and repairing it costs serious money.
Electronics. Gesture control acts up now and then—an iDrive firmware update cures it. Laser headlights are replaced as complete units when they fail, and that is very expensive.
The Fix
Pre-purchase inspection. Test the G23 roof: cycle it open and closed several times and make sure it moves smoothly. Inspect the seals—damaged ones let water in. Check the suspension for clunks and examine the bushings. Confirm the iDrive firmware is current—outdated software causes infotainment glitches.
Maintenance schedule. Stick to the replacement intervals—they extend the life of every assembly:
| Operation | Interval |
|---|---|
| Engine oil | 9,300–12,400 miles or annually |
| Automatic transmission fluid and filter | 37,000–50,000 miles |
| Differential oil | 37,000 miles |
| Brake fluid | every 2 years |
| Coolant | every 4 years |
Use only oils that meet BMW specifications—skimping on consumables ends in expensive engine and transmission repairs.
Convertible specifics. Check and lubricate the roof mechanism every year—it prevents jams and a costly repair. Keep an eye on seal condition.
Software updates. Look for fresh iDrive and other module firmware once a year—updates fix bugs and improve infotainment behavior.
Prevention
- Service the suspension regularly—replace bushings at the first clunks
- Update software annually to head off electronics glitches
- Use quality oils that strictly meet BMW approvals
- Have a specialist inspect the roof mechanism before you buy a convertible
- Check the coolant level and hose condition—leaks lead to overheating
The Bottom Line
The BMW 4 Series is a dependable car once you know its weak spots. The B58 ranks among BMW’s most reliable engines; the B47, by contrast, needs attention to its injection system and EGR valve. The sporting suspension speeds up wear in the chassis, so regular maintenance isn’t a luxury—it’s a necessity. Begin by inspecting the suspension and the roof—that alone will save you thousands of dollars.