2020 BMW 840i xDrive Service and Repair Manual

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Factory-Grade Data

2020 BMW 840i xDrive service and repair manual — a detailed, factory-style reference for maintenance, diagnostics, and repair. Use it to confirm correct procedures, specifications, and system coverage before you start work.

Designed for technicians and DIY owners, this manual helps you troubleshoot accurately, follow step-by-step repair procedures, and reference wiring diagrams and system sections quickly while you work.

What’s included

  • Step-by-step repair procedures and service information
  • Specifications and reference data (where provided)
  • Wiring diagrams and electrical sections
  • Powertrain, brakes, steering, suspension, HVAC and more

Trims covered

  • Base Convertible 2-Door
  • Base Coupe 2-Door

Engines covered

  • 3.0L 2998CC l6 GAS DOHC Turbocharged

Index / Table of contents

  • Body
  • Brakes
  • Chassis Electrical
  • Driveline
  • Engine Cooling
  • Engine Electrical
  • Engine Mechanical
  • Engine Performance & Emission Controls
  • Fuel System
  • General Information & Identification
  • Heating, Ventilation, & Air Conditioning
  • Hybrid & Electric Vehicle Systems
  • Steering
  • Suspension
  • Transmission, Clutch, & Transfer Case
  • Wiring Diagrams

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Vehicle Safety Data

2020 BMW 840i xDrive Recalls & Complaints

NHTSA #25V64400025/09/2025Component: ELECTRICAL SYSTEM:STARTER ASSEMBLY

BMW of North America, LLC (BMW) is recalling certain 2020 340I, X6, 2020-2025 840I, 2020-2022 740LI, 2019-2020 X7, and X5 vehicles. After repeated attempts, the starter motor may overheat from an elec

Consequence

An overheated starter motor can ignite nearby combustible material in the engine compartment, increa

Remedy

Dealers will replace the engine starter, free of charge. This recall includes vehicles repaired und

NHTSA #20V16400019/03/2020Component: SEAT BELTS:FRONT:BUCKLE ASSEMBLY

BMW of North America, LLC (BMW) is recalling certain 2020 X3 xDrive30e, X4 xDrive30i, X4 M40i, X4M, 330i, 330i xDrive, M340i, 840i Gran Coupe, 840i xDrive Gran Coupe, M850i xDrive Gran Coupe, M8 Gran

Consequence

If the air bag and/or seat belt pretensioners deploy improperly in the event of a crash, there is an

Remedy

BMW will notify owners, and dealers will inspect and replace the front seat belt buckles, as necessa

NHTSA #21V09600019/02/2021Component: BACK OVER PREVENTION: SENSING SYSTEM: CAMERA

BMW of North America, LLC (BMW) is recalling certain 2019-2021 X3 sDrive30i, X3 xDrive30i, X3 M40i, X3M, X4 xDrive30i, X4 M40i, M550i, X4M, X5 sDrive40i, X5 xDrive40i, X5 xDrive50i, X5M, X5 M50i, X7 x

Consequence

If the driver relies on only the rearview camera image, the missing or reduced rearview image view c

Remedy

BMW will notify owners, and dealers will inspect the rearview camera software and update it if neces

NHTSA #21V06200010/02/2021Component: SERVICE BRAKES, HYDRAULIC

BMW of North America, LLC (BMW) is recalling certain 2020-2021 8 Series Coupe, Grand Coupe and convertible 840i, 840i xDrive, M850i xDrive, M8 and 740 Li, 740 Li xDrive, 750 Li xDrive, M760 Li xDrive,

Consequence

A loss of ABS and a reduction in braking assistance can increase the risk of a crash.

Remedy

BMW will notify owners, and dealers will replace the integrated brake system, free of charge. Owner

TSB #11032729

The EVAP systems purge (vent) valve limited warranty for defects in materials and / or workmanship has been extended to 15 years / 150,000 miles as determined from the original first in-service / delivery date.

TSB #11022110

If the seat ventilation is deactivated via the switch or due to parking the vehicle, the fans in the seat cushionor under the seat cushion surface are unpleasantly loud. The fans speed up loudly twice and then turn off. The functionality of

TSB #11016472

There is a jerking or shuddering during either or both of the following: Cornering or accelerating from low speeds Driving with low to medium loads There are no warning lights or Check Control messages.

TSB #11010768

For this vehicle, the engine coolant thermostat limited warranty for defects in materials or workmanship has been extended to 15 years/150,000 miles, as determined from the original in-service date.

TSB #10250601

The functionality of the left rear SRR sensor could be reduced which would display the Driving Assistance Check Control Message.

TSB #10250600

The functionality of the right rear SRR sensor could be reduced which would display the "Driving Assistance"- Check Control Message.

TSB #10250893

SITUATION BMW AG is conducting a Voluntary Emissions Recall (effective April 23, 2021) on a certain Model Year 2020 - 2021 BMW vehicles that were produced between August 13, 2019 and December 11, 2020. Do not deliver to a customer, a New, C

TSB #10249017

SITUATION Unusual noises occur only when operating the steering column in the axial direction. 1. A one-time thump sound at the start of movement Shortly after the steering column starts moving, retracting, or extending, a one-time thump no

Showing the 8 most recent of 173 technical service bulletins on file with NHTSA.

20241031Component: SERVICE BRAKES, HYDRAULIC

The contact owns a 2020 BMW 840I. The contact stated while driving 30 MPH, the vehicle abruptly decelerated and nearly came to a complete stop. The contact was able to pull to the shoulder of the road

20240821Component: ELECTRICAL SYSTEM

My vehicle mileage was about 50,000 miles and well maintained by BMW dealership in my area. I was driving to work when suddenly my vehicle alerted me to a fault on display panel showing a power supply

20240821Component: ENGINE

My vehicle mileage was about 50,000 miles and well maintained by BMW dealership in my area. I was driving to work when suddenly my vehicle alerted me to a fault on display panel showing a power supply

Showing the 3 most serious of 5 complaints filed with NHTSA.

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