2020 Bmw I3 – Maximizing Efficiency, Maintenance, And Ownership
The 2020 BMW i3 is a sophisticated electric vehicle that blends sustainable materials with a unique carbon-fiber-reinforced plastic chassis. This guide provides essential insights into maintenance, battery care, and DIY troubleshooting to help you get the most out of this modern classic. Whether you own the pure electric model or the Range Extender version, understanding these systems ensures a reliable and efficient driving experience.
Deciding to transition to an electric vehicle often comes with a steep learning curve regarding charging, battery health, and specialized maintenance. You might worry about the longevity of the high-voltage system or how to handle unique tire requirements.
I promise to break down every technical aspect of the 2020 bmw i3 into manageable, actionable steps that any DIY enthusiast can follow. We will cover everything from the critical 12V battery replacement to optimizing your Range Extender (REx) for long-distance travel.
We will preview the specific tools you need for home service, common pitfalls to avoid, and how to use software coding to unlock hidden features. By the end of this article, you will have the confidence to maintain your i3 like a seasoned technician.
Understanding the 2020 bmw i3 Platform
The 2020 bmw i3 represents the pinnacle of BMW’s “Project i” experiment, featuring the largest battery capacity ever offered for this model. This 120 Ah (42.2 kWh) battery provides a significant range boost compared to earlier versions, making it much more practical for daily commuting.
Unlike traditional steel cars, the i3 uses a LifeDrive architecture, which consists of an aluminum drive module and a carbon fiber passenger cell. This design makes the car incredibly light, but it also means you must handle the body and frame differently during repairs.
When you lift the car, you must use specific jack pad adapters to avoid damaging the plastic rocker panels or the carbon fiber frame. Never place a floor jack directly against the underside without these adapters, as the structural integrity depends on precise lifting points.
Essential Maintenance for Your 2020 bmw i3
While electric vehicles have fewer moving parts than internal combustion engines, the 2020 bmw i3 still requires a dedicated service schedule. Neglecting these items can lead to reduced efficiency or expensive component failures down the road.
The most important maintenance task is the brake fluid flush, which BMW recommends every two years. Because EVs use regenerative braking, the mechanical brakes are used less frequently, which can allow moisture to build up in the lines and cause corrosion.
You should also replace the cabin air filters annually to maintain air quality and HVAC efficiency. These filters are located behind the center console and require a bit of flexibility to reach, but they are a straightforward DIY task for any owner.
The Critical 12V Battery Swap
The 12V battery is the most common point of failure for the i3, often causing “Drivetrain Malfunction” errors that look terrifying but are simple to fix. This battery powers the car’s computers and engages the high-voltage contactors.
To replace it, you must first remove the “frunk” (front trunk) storage bin by loosening several T25 and T30 Torx bolts. Once the bin is out, you will see the small motorcycle-sized battery tucked near the bulkhead.
Always disconnect the high-voltage disconnect switch (the bright orange plug) before working on the 12V system. This is a vital safety step that ensures no high-voltage current flows while you are handling the lead-acid battery.
Maintaining the Range Extender (REx)
If your 2020 bmw i3 is equipped with the Range Extender, you essentially have a small 647cc scooter engine in the back. This engine requires its own oil and filter changes, typically every 12 months or according to the CBS (Condition Based Service) indicator.
Use a high-quality 5W-30 synthetic oil and a genuine BMW filter to keep the REx running smoothly. Accessing the engine requires removing the floor panel in the trunk, which is held down by several Torx screws.
It is a good practice to run the REx at least once a month to keep the seals lubricated and the fuel fresh. If you rarely use the engine, consider adding a fuel stabilizer to the gas tank to prevent the fuel from degrading over time.
Tires and Suspension Care
The tires on the 2020 bmw i3 are unique; they are tall and very narrow to reduce rolling resistance. Bridgestone Ecopia tires are the standard, and they tend to wear out faster than traditional tires due to the high torque of the electric motor.
Check your tire pressure weekly, as these tires operate at higher pressures (often 33-41 PSI depending on the load). Low pressure significantly reduces your range and causes the outer edges of the tread to wear prematurely.
If you notice a “vibration” or “shudder” at highway speeds, it is likely an alignment issue or a flat spot on the tire. Because the i3 is rear-wheel drive and has a short wheelbase, keeping the alignment within factory specs is crucial for stable handling.
Upgrading the Ride Quality
Many owners find the factory suspension a bit “bouncy” on rough roads. You can improve the handling by installing wheel spacers (usually 11mm to 15mm), which widen the track and provide a more planted feel in corners.
If you are a weekend DIYer, replacing the shocks with aftermarket options like Bilstein or Koni can transform the ride. This requires a spring compressor and a few hours in the garage, but it is one of the most rewarding performance mods for this platform.
Always torque your lug bolts to 103 lb-ft (140 Nm) when putting the wheels back on. Over-tightening can damage the aluminum hubs, while under-tightening is a major safety risk on the road.
Charging Best Practices for Battery Longevity
To keep the high-voltage battery in your 2020 bmw i3 healthy, try to keep the state of charge (SoC) between 20% and 80% for daily use. While the 120 Ah battery has a robust buffer, avoiding extreme levels of charge helps prevent chemical degradation.
Level 2 charging at home is the most convenient way to “refuel.” Ensure your home charging station is installed on a dedicated 40-amp circuit to handle the i3’s 7.4 kW onboard charger efficiently.
If you use DC Fast Charging (Level 3), be aware that the charging speed will slow down significantly once the battery reaches 80%. This is a protective measure by the Battery Management System (BMS) to prevent overheating the lithium-ion cells.
Preconditioning for Maximum Range
In cold weather, use the “Precondition for Departure” feature while the car is still plugged in. This uses grid power to warm the battery and the cabin, ensuring the battery is at its optimal operating temperature before you drive.
A cold battery has higher internal resistance, which reduces available power and regenerative braking capacity. By preconditioning, you can gain up to 10-15% more range during winter months, making your commute much more predictable.
You can set the departure time via the My BMW App or through the iDrive menu in the car. This simple habit saves wear on the battery and makes the interior comfortable the moment you step inside.
Coding and Software Tweaks
One of the best things about owning a 2020 bmw i3 is the ability to “code” hidden features using an OBDII adapter and an app like BimmerCode. This allows you to customize the car’s behavior to suit your needs.
For REx owners, the most popular tweak is “Hold State of Charge” (HSOC). This allows you to manually turn on the Range Extender once the battery drops below 75%, rather than waiting for the car to do it automatically at 6%.
HSOC is incredibly useful for long highway trips where you want to save battery power for city driving at your destination. You can also code the car to start in Eco Pro mode by default or change the chime sounds to the “BMW i” branding.
Always use a high-quality OBDII Bluetooth adapter that is officially supported by the coding software. Interrupted data transmission during a coding session can “brick” a control module, requiring a trip to the dealership to reset.
Common Problems and Troubleshooting
Even with its high reliability, the 2020 bmw i3 has a few known quirks. The charge port door, for example, can sometimes get stuck or fail to lock. Usually, this is caused by a failing actuator or dirt buildup around the locking pin.
If your REx won’t start, the most common culprit is a bad fuel pump relay or a fouled spark plug. These are relatively inexpensive parts that a DIY mechanic can replace with basic hand tools and a bit of patience.
Another issue is “creaking” from the front suspension when going over speed bumps. This is often caused by the upper strut mounts or the rubber dust boots rubbing against the shocks. Applying a small amount of silicone lubricant can often silence these noises temporarily.
Dealing with Drivetrain Malfunctions
If you see a “Drivetrain Malfunction” warning, do not panic. Pull over safely, turn the car off, wait two minutes, and restart it. Often, this is a transient sensor error or a sign that your 12V battery is starting to fail.
If the error persists, use an OBDII scanner to read the specific fault codes. This will tell you if the issue is with the E-motor, the REx, or the charging system, allowing you to give the technician accurate information.
Never attempt to service the high-voltage cables (the orange ones) yourself. These carry upwards of 350 volts and can be lethal. Always leave internal battery or motor repairs to a certified BMW i technician.
Frequently Asked Questions About 2020 bmw i3
What is the real-world range of the 2020 bmw i3?
In ideal conditions, you can expect about 150 miles of range from the BEV model. The Range Extender (REx) model offers about 125 miles of electric range plus an additional 60-80 miles from the gasoline tank.
How long does it take to charge a 2020 bmw i3?
On a standard Level 2 home charger, it takes about 6-7 hours to go from empty to full. Using a 50kW DC Fast Charger, you can reach an 80% charge in approximately 40 minutes.
Does the 2020 bmw i3 have a heat pump?
The pure electric (BEV) models often come equipped with a heat pump, which is much more efficient for heating the cabin. However, the Range Extender (REx) models use resistive heating because there is no room for the heat pump components near the engine.
What are the best tires for the 2020 bmw i3?
The Bridgestone Ecopia EP422 Plus is the most common choice for efficiency. For those in colder climates, the Bridgestone Blizzak LM-500 is the go-to winter tire, though it will slightly reduce your total range.
Can I tow a trailer with my 2020 bmw i3?
BMW does not officially rate the i3 for towing in North America. While some owners install aftermarket hitches for bike racks, towing a heavy trailer can strain the drivetrain and void your warranty.
Final Thoughts on the 2020 bmw i3
The 2020 bmw i3 remains one of the most unique and rewarding electric vehicles on the road today. Its carbon fiber construction, sustainable interior, and nimble handling make it a joy to drive and a fascinating project for any DIY mechanic.
By staying on top of the 12V battery health, maintaining your REx engine, and using coding tools to customize your experience, you can ensure your i3 stays on the road for years to come. Remember to always prioritize safety when working around high-voltage systems and use the right tools for every job.
Whether you are navigating tight city streets or heading out on a weekend adventure, your i3 is a testament to what happens when engineering meets imagination. Stay safe and stay charged!
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