2014–presentLuxury Coupe / Convertible$1,112/yr avg repair

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BMW 4 Series Extended Warranty — Coverage Guide 2026

The 4 Series convertible's hydraulic top mechanism costs $1,500–$4,000 to repair when it fails — a failure mode unique to convertible ownership. Combine that with the N55 turbocharger at $4,500 and the N20 timing chain's catastrophic failure potential, and the 4 Series has a repair cost profile that makes comprehensive coverage a clear financial decision.

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Avg annual repair

$1,112

after factory warranty

Major drivetrain repair

$2,500+

N55 Turbocharger Failu…

Engine/motor repair

$2,000+

typical top-end service

Coverage from

~$115/mo

comprehensive plan

Common BMW 4 Series Issues — Repair Costs

Issue	Estimated Cost	Frequency	Covered
N55 Turbocharger Failure	$2,000–$4,500	Common	✅ Yes
B48 High-Pressure Fuel Pump Failure	$800–$1,800	Common	✅ Yes
N20 Timing Chain (4-cyl older models)	$2,000–$5,000	Common	✅ Yes
Convertible Top Hydraulic Failure (430i Conv.)	$1,500–$4,000	Common	✅ Yes
Oil Filter Housing Gasket Leak	$400–$1,200	Common	✅ Yes
Electric Water Pump Failure	$800–$1,500	Common	✅ Yes

BMW 4 Series Factory Warranty — What Expires When

Bumper-to-Bumper

4 years / 50,000 miles

Powertrain

4 years / 50,000 miles

Coverage gap: Once the bumper-to-bumper warranty lapses, mechanical failures — electrical, HVAC, infotainment, suspension — are fully out of pocket. Third-party extended coverage bridges this gap and can extend beyond the powertrain warranty as well.

4 Series Coverage Tiers & Pricing

Powertrain

From $70/mo

Engine, transmission, drivetrain

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Powertrain + Systems

From $95/mo

Above + electrical, A/C, fuel, convertible top mechanism

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Comprehensive

From $115/mo

All mechanical & electrical systems (exclusionary)

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Pricing estimates based on typical third-party provider rates for this model. Actual quotes depend on model year, mileage, and coverage level. Get an exact quote from Chaiz in under 3 minutes.

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Chaiz covers any licensed shop. Instant online quote — no phone call required.

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BMW 4 Series Extended Warranty — Common Questions

Does the BMW 4 Series need an extended warranty?▼

Yes — the BMW 4 Series averages $1,112/year in repair costs once the factory warranty expires. The most expensive single repair (N55 Turbocharger Failure) costs $2,000–$4,500 — often covering 12–36 months of extended warranty premiums in a single claim.

What is the BMW 4 Series factory warranty?▼

BMW provides 4 years / 50,000 miles bumper-to-bumper and 4 years / 50,000 miles powertrain coverage. After these terms expire, all mechanical and electrical repairs are fully out of pocket.

How much does BMW 4 Series extended warranty cost per month?▼

Third-party extended warranties for the BMW 4 Series range from $70–$115/month depending on coverage tier, model year, and mileage. Comprehensive plans covering the full range of issues cost the most but provide the broadest protection.

What is the most common BMW 4 Series problem?▼

N55 Turbocharger Failure is the most frequently reported issue, with repair costs of $2,000–$4,500. This is rated "Common" in owner reports and industry data. Extended warranty coverage addresses this directly.

Can I use any repair shop with a BMW 4 Series extended warranty?▼

Chaiz covers any licensed repair facility — including BMW dealerships and independent specialists. Other providers may restrict you to specific networks. Shop flexibility is important for brand-specific repairs that require specialized tooling or expertise.

Is extended warranty available for BMW 4 Series in California?▼

Yes — Chaiz, Endurance, autopom!, and CARCHEX all cover California BMW 4 Series owners. CarShield is the only major provider not available in California, which has one of the largest BMW owner populations in the US.

What does BMW 4 Series extended warranty not cover?▼

Typical exclusions include cosmetic damage, wear items (tires, brake pads, wiper blades), damage from accidents or misuse, pre-existing conditions at time of purchase, and scheduled maintenance services. Performance or track use exclusions may apply to sportier trims.

When is the best time to buy BMW 4 Series extended warranty?▼

The optimal window is when the vehicle is between 1–3 years old and 20,000–60,000 miles — past initial break-in but before high-mileage failures increase actuarial rates. Most plans have a 30-day / 1,000-mile waiting period, so purchase while the vehicle is in confirmed good condition.

Other BMW Models

3 Series

$1,097/yr

5 Series

$1,173/yr

$1,166/yr

$1,034/yr

View all BMW models →

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