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BMW · Known Issues

2014-2025 BMW 4 Series Problems: 6 Known Issues

2014-2025 model years · 450+ owner reports · Updated September 2026

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Issue summary

According to Au7o's analysis of 450+ owner reports, the 2014-2025 BMW 4 Series has 6 documented known issues, with 2 rated critical. The most serious are Lower-Engine Whine Requires 428i N20/N26 Timing-Chain Diagnosis and N20 Timing Chain Premature Failure - 428i F32/F33/F36 ($2,500-$4,500 repair). The most commonly reported issue is B58 Charge Pipe Pop-Off Under Boost with 250 owner reports. Across all issues with published estimates, repair costs range from $200 to $4,500. DIY maintenance guides at au7o.io.

In This Article

  • 4 Series Engine5
  • 4 Series Body/Panels1
  • Recalls1
  • FAQ
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In This Article

  • Engine5
  • Body/Panels1
  • Recalls1
  • FAQ

All 6 Known Issues

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BMW SIB 11 03 17 identifies specified F32, F33 and F36 428i variants with N20 or N26 engines produced through February 2015. A whining noise from the lower engine area that rises with engine speed can be associated with wear in the timing-chain or oil-pump drive-chain system; the bulletin does not declare every 428i defective.

This issue also affects: BMW 1 Series, BMW 2 Series, BMW 3 Series

Common Symptoms

  • Whining from the lower engine area
  • Noise frequency increases with engine speed

How to Fix

Confirm the exact chassis, engine, production date and VIN eligibility, then have a BMW-qualified technician reproduce the noise and follow the current BMW diagnostic procedure before replacing anything. The historical seven-year/70,000-mile coverage was a limited warranty extension, not a recall, and is not a current coverage promise. ShowMeTheParts returned no exact 2014 428i timing-chain candidate, so no commerce link is approved.

Find a nearby BMW repair shop in Google Maps ↗

Call to confirm they can assess your vehicle and perform the stated work. Search results do not confirm qualification, eligibility or coverage.

Research This Issue

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NHTSA Verified
High ConfidenceVerifiedReviewed Jul 2026

The N20 2.0L turbocharged engine in 428i models suffers from premature timing chain stretch and guide failure, typically occurring between 40,000-80,000 miles. The single-row timing chain design is inadequate for the engine's power output. Chain stretch causes the timing to jump, leading to rough running, poor performance, and potential catastrophic engine damage if the chain breaks. BMW issued a class action settlement covering 8 years/100,000 miles. This is identical to the N20 timing chain issue in 328i/X3/X5 models using the same engine.

This issue also affects: BMW 1 Series, BMW 2 Series, BMW 3 Series

Common Symptoms

  • Rattling noise from engine on cold start (first 5 seconds)
  • Check engine light with timing correlation codes (P0016, P0017, P0018, P0019)
  • Rough idle or misfires
  • Loss of power or hesitation on acceleration
  • Engine won't start after chain failure

How to Fix

Complete timing chain kit replacement including chain, guides, tensioner, and sprockets. Must be performed by experienced BMW technician. Preventive replacement recommended at 60,000-80,000 miles. BMW extended warranty to 8 years/100,000 miles under class action settlement. Upgraded reinforced chain kit available from aftermarket.

Find a nearby BMW repair shop in Google Maps ↗

Call to confirm they can assess your vehicle and perform the stated work. Search results do not confirm qualification, eligibility or coverage.

What you need to fix it

Only diagnosis- and fitment-reviewed repair parts are linked here.

  • Iwis N20 timing-chain kit 11315A19AA2

    Fitment: F32/F33/F36 BMW 428i and 428i xDrive with N20 as listed by Turner; use the vehicle selector and confirm VIN/production date. Kit lists chain, gaskets, guides/rails, sprocket and hardware; technician must confirm any additional o…

    Turner Motorsport

As an Amazon Associate, we earn from qualifying purchases; other part links may also earn au7o a commission. Confirm fitment by VIN before buying.

Typical repair cost:$2,500 - $4,500

Research This Issue

GoogleRedditYouTubeNHTSA
Community Reported
Medium ConfidenceVerifiedReviewed Aug 2026
Community reported
250 owners

The plastic charge pipe (intercooler to throttle body) on B58-powered 440i and M440i models can pop off or crack under high boost pressure, especially in warm weather or during spirited driving. The OEM plastic pipe uses a pressed-on connector that weakens over heat cycles. When the pipe disconnects, the engine immediately loses boost pressure and enters limp mode with significant power loss.

This issue also affects: BMW X4, BMW Z4, MINI Clubman

Common Symptoms

  • Sudden loss of power during hard acceleration
  • Loud pop or hissing sound from engine bay
  • Boost pressure fault codes stored in DME
  • Check Engine light with underboost code
  • Engine running rough after the pipe disconnects
  • Whistling or whooshing noise under throttle

How to Fix

Replace the OEM plastic charge pipe with an upgraded aluminum aftermarket unit. These use proper clamp-style connections that won't pop off under pressure. If replacing with OEM, use the latest revision part number. Check the intercooler boots and couplings for damage from the pressure release event.

What you need to fix it

Only diagnosis- and fitment-reviewed repair parts are linked here.

  • BMS Elite Gen1 B58 F-chassis aluminum charge pipe

    Select the correct engine option and confirm chassis before ordering..

    Burger Tuning
  • BMS B58TU Gen2 G-chassis charge pipe

    The vendor page does not currently confirm 2025, so do not extend this link to 2025 without revalidation..

    Burger Tuning

As an Amazon Associate, we earn from qualifying purchases; other part links may also earn au7o a commission. Confirm fitment by VIN before buying.

Typical repair cost:$200 - $500

Research This Issue

Based on 250 owner reports

GoogleRedditYouTubeNHTSA
Community Reported
High ConfidenceVerified250 owner reportsLast reported by owners Mar 2026Reviewed Aug 2026
Community reported
200 owners

The valve cover gasket on N20 (428i) and N55 (435i) engines develops leaks typically between 60,000-90,000 miles. The integrated PCV valve within the valve cover can also fail, causing excessive crankcase pressure, oil consumption, and rough running. Oil seepage from the valve cover can contaminate spark plug wells and cause misfires.

This issue also affects: BMW 1 Series, BMW 2 Series, BMW 3 Series

Common Symptoms

  • Oil smell from engine bay, stronger when parked after driving
  • Oil residue visible on valve cover edges
  • Rough idle from failed PCV valve
  • Whistling or sucking noise from engine (PCV vacuum leak)
  • Increased oil consumption between changes
  • Misfires from oil in spark plug wells

How to Fix

Replace the entire valve cover assembly as the gasket and PCV are integrated into the plastic cover on both N20 and N55 engines. Clean spark plug wells of any oil contamination and replace spark plugs if oil-fouled. Use a torque wrench to properly seat the new cover — over-tightening cracks the plastic housing.

What you need to fix it

Only diagnosis- and fitment-reviewed repair parts are linked here.

  • Genuine BMW N20 cylinder-head-cover gasket set 11127588418
    OEM11127588418

    Fitment: 2014-2016 F32/F33/F36 BMW 428i with N20; confirm VIN and required companion seals, fuel line and fasteners in the BMW diagram..

    BMW Parts Deal
  • Genuine BMW N20 cylinder-head cover 11127588412
    OEM11127588412

    Fitment: 2014-2016 F32/F33/F36 BMW 428i with N20; confirm N20 rather than N26 and order BMW-diagram companion parts required for the VIN..

    BMW Parts Deal
  • Genuine BMW N55 valve-cover profile gasket 11127587804
    OEM11127587804

    Fitment: 2014-2016 F32/F33 and 2015-2016 F36 BMW 435i/435i xDrive with N55; confirm VIN and companion seals..

    BMW Parts Deal
  • Genuine BMW N55 cylinder-head cover 11127570292
    OEM11127570292

    Fitment: 2014-2016 F32/F33 and 2015-2016 F36 BMW 435i/435i xDrive with N55; confirm VIN and BMW-diagram companion fasteners..

    BMW Parts Deal

As an Amazon Associate, we earn from qualifying purchases; other part links may also earn au7o a commission. Confirm fitment by VIN before buying.

Typical repair cost:$500 - $1,200

Research This Issue

Based on 200 owner reports

GoogleRedditYouTubeNHTSA
Community Reported
High ConfidenceVerified200 owner reportsLast reported by owners Mar 2026Reviewed Aug 2026

The N55 3.0L turbocharged inline-6 engine in 435i and early 440i models experiences VANOS (Variable Valve Timing) solenoid failures. These solenoids control oil flow to the VANOS system for variable valve timing. Internal wear causes them to stick or fail, leading to rough running, power loss, and check engine lights. The intake VANOS solenoid (cylinder head front) fails more frequently than the exhaust solenoid. Oil contamination and sludge accelerate failure. This is a common issue shared with N55-powered 335i, 535i, and X5 35i models.

This issue also affects: BMW 7 Series, BMW 8 Series, BMW M2

Common Symptoms

  • Rough idle or engine stumble
  • Check engine light with VANOS codes (P0011, P0012, P0021, P0022)
  • Loss of power or poor throttle response
  • Increased fuel consumption
  • Cold start rough running that improves when warm

How to Fix

Replace failed VANOS solenoid(s). Both intake and exhaust solenoids should be inspected. Clean VANOS system if contaminated with sludge. Use high-quality full synthetic oil (BMW LL-01 spec) and maintain 7,500-mile oil change intervals to prevent premature failure. Some shops recommend replacing both solenoids preventively.

What you need to fix it

Only diagnosis- and fitment-reviewed repair parts are linked here.

  • Genuine BMW N55 VANOS solenoid valve 11368605123
    OEM11368605123

    BMW catalogs quantity two but replace only the diagnosed failed position unless the repair plan calls for both; confirm VIN..

    BMW Parts Deal

As an Amazon Associate, we earn from qualifying purchases; other part links may also earn au7o a commission. Confirm fitment by VIN before buying.

Typical repair cost:$250 - $800

Research This Issue

GoogleRedditYouTubeNHTSA
Community Reported
Medium ConfidenceVerifiedReviewed Aug 2026

The F33 4 Series convertible uses a complex hydraulic folding hardtop system that commonly experiences pump and motor failures. The hydraulic pump motor burns out from overheating or seal leaks cause hydraulic fluid loss. Top becomes stuck in partially open/closed position. Microswitch sensors that detect top position also fail frequently, preventing top operation even when hydraulics work. Exposure to weather and infrequent operation accelerate failures. This affects all F33 convertibles and is similar to issues in E93 3 Series convertibles.

Common Symptoms

  • Convertible top stuck partially open or closed
  • Top operation warning message on iDrive
  • Whining or grinding noise when operating top
  • Top moves slowly or stops mid-cycle
  • Hydraulic fluid leak in trunk area
  • Top won't unlatch or latch properly

How to Fix

Diagnose specific failure point - pump motor, hydraulic lines, microswitches, or latch mechanisms. Hydraulic pump motor replacement is most common repair. Check hydraulic fluid level and refill if low. Inspect all microswitches and sensors for proper operation. Regular top cycling (once per month minimum) prevents seals from drying out. Store with top up to reduce strain on hydraulics.

Typical repair cost:$1,200 - $3,500

Research This Issue

GoogleRedditYouTubeNHTSA
Community Reported
Medium Confidence
NHTSA Recalls1 recall

POWER TRAIN:AUTOMATIC TRANSMISSION:CONTROL MODULE (TCM/PCM/TECM)

BMW of North America, LLC (BMW) is recalling certain 2023 Toyota GR Supra, 3 Series Sedan (330i xDrive, M340i xDrive, M3), 5 Series Sedan (530i, 530i xDrive, M5), 4 Series Gran Coupe (430i, 430i xDrive), 4 Series Coupe (430i, 430i xDrive, M440i xDrive), 4 Series Convertible (430i, 430i xDrive, M440i xDrive), 8 Series Coupe (840i, M850i xDrive, M8), 8 Series Convertible (840i, M850i xDrive, M8), 8 Series Gran Coupe (850i xDrive, M8), X3 SAV (X3 xDrive30i, X3M), X4 SAV (X4 xDrive30i), X5 SAV (X5 xDrive40i, X5 M50i, X5M), X6 SAV (X6 xDrive40i, X6 M50i, X6M), and Z4 sDrive30i, Z4 M40i vehicles. The weld seam of the integrated transmission control unit's cover may not have been manufactured properly, which could allow automatic transmission oil to leak into the transmission control unit.

Campaign #23V82100006/12/2023

Enter your VIN at NHTSA.gov to check recalls specific to your vehicle.

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Frequently Asked Questions

What are the most common BMW 4 Series problems?

According to Au7o's analysis of 450+ owner reports, the 2014-2025 BMW 4 Series has 6 documented issues. The most frequently reported are: Lower-Engine Whine Requires 428i N20/N26 Timing-Chain Diagnosis, N20 Timing Chain Premature Failure - 428i F32/F33/F36, B58 Charge Pipe Pop-Off Under Boost. Of these, 2 are rated critical and should be addressed promptly.

Is the BMW 4 Series reliable?

The 2014-2025 BMW 4 Series has 6 known issues documented across 450+ owner reports. 2 issues are rated critical: Lower-Engine Whine Requires 428i N20/N26 Timing-Chain Diagnosis and N20 Timing Chain Premature Failure - 428i F32/F33/F36. Prospective buyers should inspect for these issues and factor potential repair costs into their purchase decision. Regular maintenance following the manufacturer's schedule helps prevent many common problems.

How much does it cost to fix common BMW 4 Series problems?

Repair costs for known BMW 4 Series issues range from $200 to $4,500, depending on the specific problem and whether you choose DIY or professional repair. Au7o provides step-by-step DIY maintenance guides that can help reduce repair costs.

What year BMW 4 Series is the most reliable?

Reliability varies across model years of the BMW 4 Series. Based on documented issues, problems are most commonly reported in earlier model years. Au7o recommends checking the specific known issues for your target year before purchasing, and having a pre-purchase inspection performed by a qualified mechanic. Our known issues database covers the 2014-2025 BMW 4 Series with 6 documented issues documented across 450+ owner reports.

What is the 2014-2015 BMW 4 Series Lower-Engine Whine Requires 428i N20/N26 Timing-Chain Diagnosis?

BMW SIB 11 03 17 identifies specified F32, F33 and F36 428i variants with N20 or N26 engines produced through February 2015. A whining noise from the lower engine area that rises with engine speed can be associated with wear in the timing-chain or oil-pump drive-chain system; the… Severity: high.

Content on this page was compiled with AI assistance using NHTSA complaints, TSBs, owner reports, and public automotive data. While we strive for accuracy, this information may contain errors. Always verify repair procedures and specifications with your vehicle's service manual or a qualified mechanic.

Data sourced from 450+ owner reports, NHTSA recalls, TSBs, and automotive forums.

What is the 2014-2016 BMW 4 Series N20 Timing Chain Premature Failure - 428i F32/F33/F36?

The N20 2.0L turbocharged engine in 428i models suffers from premature timing chain stretch and guide failure, typically occurring between 40,000-80,000 miles. The single-row timing chain design is inadequate for the engine's power output. Chain stretch causes the timing to jump,… Repairs typically run $2,500-$4,500. Severity: high.

What is the 2017-2025 BMW 4 Series B58 Charge Pipe Pop-Off Under Boost?

The plastic charge pipe (intercooler to throttle body) on B58-powered 440i and M440i models can pop off or crack under high boost pressure, especially in warm weather or during spirited driving. The OEM plastic pipe uses a pressed-on connector that weakens over heat cycles. When… Repairs typically run $200-$500. Severity: medium.

What is the 2014-2020 BMW 4 Series Valve Cover Gasket Leak and PCV Failure?

The valve cover gasket on N20 (428i) and N55 (435i) engines develops leaks typically between 60,000-90,000 miles. The integrated PCV valve within the valve cover can also fail, causing excessive crankcase pressure, oil consumption, and rough running. Oil seepage from the valve co… Repairs typically run $500-$1,200. Severity: medium.

What is the 2014-2020 BMW 4 Series Convertible Top Hydraulic Pump & Motor Failure - F33 Convertible?

The F33 4 Series convertible uses a complex hydraulic folding hardtop system that commonly experiences pump and motor failures. The hydraulic pump motor burns out from overheating or seal leaks cause hydraulic fluid loss. Top becomes stuck in partially open/closed position. Micro… Repairs typically run $1,200-$3,500. Severity: medium.

What is the 2014-2018 BMW 4 Series N55 VANOS Solenoid Failure - 435i/440i F32/F33/F36?

The N55 3.0L turbocharged inline-6 engine in 435i and early 440i models experiences VANOS (Variable Valve Timing) solenoid failures. These solenoids control oil flow to the VANOS system for variable valve timing. Internal wear causes them to stick or fail, leading to rough runnin… Repairs typically run $250-$800. Severity: medium.