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BMW · Known Issues

2019 BMW 1 Series Problems: 3 Known Issues

2019 model year · 880+ owner reports · Updated September 2026

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Issue summary

According to Au7o's analysis of 880+ owner reports, the 2019 BMW 1 Series has 3 documented known issues, with 2 rated critical. The most serious are N20 Timing Chain and Guide Failure ($1,800-$3,500 repair) and Electric Water Pump Failure ($600-$1,200 repair). The most commonly reported issue is N20 Timing Chain and Guide Failure with 340 owner reports. Across all issues with published estimates, repair costs range from $400 to $3,500. DIY maintenance guides at au7o.io.

In This Article

  • 1 Series Engine2
  • 1 Series Other1
  • FAQ
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In This Article

  • Engine2
  • Other1
  • FAQ

All 3 Known Issues

Filter:
ALL YEARS201920182017201620152014201320122011201020092008

When Issues Typically Appear

Oil Filter Housing Gasket Leak
50K-80K
N20 Timing Chain and Guide Failure
60K-80K
Electric Water Pump Failure
60K-100K
025K50K75K100K mi
Community reported
340 owners

On the 2012-2019 BMW 1 Series N20, the N20 four-cylinder engine in the 1 Series is prone to premature timing chain stretch and guide failure, particularly in models built before 2015. The plastic chain guides become brittle over time and can break apart, allowing chain slack that leads to jumped timing. This can cause catastrophic engine damage if the chain skips enough teeth.

This issue also affects: BMW 2 Series Active Tourer, BMW 2 Series, BMW 3 Series

Common Symptoms

  • Rattling noise from front of engine on cold start
  • Check Engine light with codes P0016 or P0017 (cam/crank correlation)
  • Rough idle that smooths out after warming up
  • Reduced engine power or limp mode
  • Metallic scraping sound from timing cover area
  • Engine misfires at low RPM

How to Fix

Replace the timing chain, tensioner, and all chain guides. BMW released an updated chain guide design for 2015+ production. On earlier models, use the updated parts during replacement. The job requires removing the front of the engine and is labor-intensive (8-12 hours). Some owners opt for preventive replacement at 60,000-80,000 miles.

Typical repair cost:$1,800 - $3,500

Research This Issue

Based on 340 owner reports

GoogleRedditYouTubeNHTSA
Community Reported
High Confidence340 owner reportsLast reported by owners Mar 2026Reviewed Mar 2026
Community reported
280 owners

On the 2012-2019 BMW 1 Series N20, the oil filter housing gasket on the N20 engine deteriorates and leaks oil onto the serpentine belt and down the front of the engine. This is one of the most common oil leak points on the N20 and typically appears between 50,000-80,000 miles. The gasket hardens from heat cycling and loses its seal. Oil can drip onto the alternator and cause secondary electrical issues.

This issue also affects: BMW 2 Series, BMW 3 Series, BMW 4 Series

Common Symptoms

  • Oil smell from engine bay, especially after highway driving
  • Visible oil residue around oil filter housing area
  • Oil dripping onto serpentine belt causing squeal
  • Low oil level warning between oil changes
  • Oil spots on driveway near front of vehicle
  • Smoke from engine bay when oil hits hot exhaust components

How to Fix

Replace the oil filter housing gasket. This is a moderately involved job requiring removal of the intake manifold for access. Replace the oil cooler gasket at the same time as it's in the same area. Clean all oil residue from the serpentine belt and pulleys to prevent belt squeal.

What you need to fix it

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

  • Genuine BMW oil-filter-housing-to-block gasket 11428637821
    OEM11428637821

    Housing-to-engine-block leak repair.

    BMW Parts Deal
  • Genuine BMW oil-cooler/heat-exchanger gasket 11428637820
    OEM11428637820

    Oil-cooler-to-filter-housing leak repair. Fitment: F20/F21 BMW 125i with N20 only when the leaking cooler joint and VIN catalog call for BMW 11428637820..

    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:$400 - $900

Research This Issue

Based on 280 owner reports

GoogleRedditYouTubeNHTSA
Community Reported
High ConfidenceVerified280 owner reportsLast reported by owners Mar 2026Reviewed Aug 2026
Community reported
260 owners

On the 2012-2019 BMW 1 Series, bMW's electric water pump used in the 1 Series is known to fail prematurely, often between 60,000-100,000 miles. The pump's internal impeller can crack or the electronic controller can malfunction, resulting in loss of coolant circulation. Overheating can occur rapidly since the pump provides all engine cooling flow. BMW has revised the pump design multiple times.

This issue also affects: BMW 2 Series, BMW 5 Series, BMW 6 Series

Common Symptoms

  • Engine temperature warning on dashboard
  • Coolant temperature gauge rising rapidly
  • Reduced engine power message
  • Steam from under the hood
  • Whining or grinding noise from water pump area
  • Heater blowing cold air intermittently
  • Coolant loss without visible external leak

How to Fix

Replace the electric water pump assembly. Use the latest revision part number for improved longevity. The thermostat should be replaced at the same time as it's integrated into the cooling system and often fails concurrently. Bleed the cooling system thoroughly after replacement — air pockets can cause hot spots and additional overheating.

Typical repair cost:$600 - $1,200

Research This Issue

Based on 260 owner reports

GoogleRedditYouTubeNHTSA
Community Reported
High Confidence260 owner reportsLast reported by owners Mar 2026Reviewed Mar 2026
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Other BMW Models

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Frequently Asked Questions

What are the most common BMW 1 Series problems?

According to Au7o's analysis of 880+ owner reports, the 2019 BMW 1 Series has 3 documented issues. The most frequently reported are: N20 Timing Chain and Guide Failure, Electric Water Pump Failure, Oil Filter Housing Gasket Leak. Of these, 2 are rated critical and should be addressed promptly.

Is the BMW 1 Series reliable?

The 2019 BMW 1 Series has 3 known issues documented across 880+ owner reports. 2 issues are rated critical: N20 Timing Chain and Guide Failure and Electric Water Pump Failure. 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 1 Series problems?

Repair costs for known BMW 1 Series issues range from $400 to $3,500, depending on the specific problem and whether you choose DIY or professional repair. The most critical issue, N20 Timing Chain and Guide Failure, typically costs $1,800-$3,500 to repair. Au7o provides step-by-step DIY maintenance guides that can help reduce repair costs.

What is the 2012-2019 BMW 1 Series N20 Timing Chain and Guide Failure?

The N20 four-cylinder engine in the 1 Series is prone to premature timing chain stretch and guide failure, particularly in models built before 2015. The plastic chain guides become brittle over time and can break apart, allowing chain slack that leads to jumped timing. This can c… Repairs typically run $1,800-$3,500. Severity: high.

What is the 2012-2019 BMW 1 Series Electric Water Pump Failure?

BMW's electric water pump used in the 1 Series is known to fail prematurely, often between 60,000-100,000 miles. The pump's internal impeller can crack or the electronic controller can malfunction, resulting in loss of coolant circulation. Overheating can occur rapidly since the… Repairs typically run $600-$1,200. 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 880+ owner reports, NHTSA recalls, TSBs, and automotive forums.

What is the 2012-2019 BMW 1 Series Oil Filter Housing Gasket Leak?

The oil filter housing gasket on the N20 engine deteriorates and leaks oil onto the serpentine belt and down the front of the engine. This is one of the most common oil leak points on the N20 and typically appears between 50,000-80,000 miles. The gasket hardens from heat cycling… Repairs typically run $400-$900. Severity: medium.