Own a BMW I3 REX in the Phoenix area? EZ Swap LLC repairs and maintains the BMW I3 REX for model years 2014, 2018 to 2021. Our shop at 9050 N 9th St handles everything from routine service to diagnostics and major repairs.
To help I3 REX owners know what to watch for, we reviewed public records from the National Highway Traffic Safety Administration (NHTSA). For these model years NHTSA has 50 owner complaints on file for the I3 REX and 0 safety recall campaigns. The most-reported problem areas are power train (15), electrical system (12), fuel/propulsion system (11).
Most-Reported BMW I3 REX Problems
These problem areas come up most often in NHTSA owner complaints for the I3 REX (all model years combined). Complaint counts reflect reports filed, not the share of vehicles affected, so popular and older models naturally have more.
| Problem area (NHTSA component) | Complaints | Share | |
|---|---|---|---|
| Power Train | 15 | 30% | |
| Electrical System | 12 | 24% | |
| Fuel/Propulsion System | 11 | 22% | |
| Steering | 10 | 20% | |
| Engine | 9 | 18% | |
| Vehicle Speed Control | 7 | 14% | |
| Structure | 5 | 10% | |
| Seat Belts | 3 | 6% |
Power Train
15 of the 50 complaints (30%) mention the powertrain. Powertrain complaints can range from rough shifting to loss of drive. We road test, scan for stored codes and inspect fluids before recommending any repair. See our auto repair page.
Electrical System
12 of the 50 complaints (24%) mention the electrical system. Electrical problems are made worse by desert heat, which ages batteries, cables and connectors. We test the battery, starter and charging system and trace faults to the actual part. See our battery replacement and starter & alternator repair pages.
Fuel/Propulsion System
11 of the 50 complaints (22%) mention the fuel system. Fuel system problems can cause stalling, hard starts and poor mileage. We test fuel delivery and related sensors to find the real cause. See our no-start diagnostics and check engine light diagnostics pages.
BMW I3 REX Complaints by Model Year
The I3 REX model years with the most NHTSA complaints on file are 2014, 2018, 2019. Older model years have had more time to collect reports, so use this table as a guide for what to inspect, not as a verdict on any one vehicle.
| Model year | Complaints on file | |
|---|---|---|
| 2014 | 22 | |
| 2018 | 14 | |
| 2019 | 13 | |
| 2021 | 1 |
BMW I3 REX Check Engine Codes
NHTSA owner complaints rarely cite specific trouble codes for the I3 REX, so we do not have a model-specific ranking to show. These are the check engine codes we see most often on vehicles in Phoenix heat, and any of them can show up on a BMW.
| Code | What it means |
|---|---|
| P0420 | Catalyst efficiency below threshold (bank 1) Often a worn catalytic converter, but failing oxygen sensors or exhaust leaks can set it too. Can cause an emissions test failure. |
| P0300 | Random or multiple cylinder misfire Worn spark plugs, failing ignition coils, fuel or vacuum problems. Do not ignore a flashing check engine light. |
| P0171 | System too lean (bank 1) Often a vacuum leak, dirty MAF sensor, weak fuel delivery or a failing oxygen sensor. |
| P0455 | EVAP system large leak Missing or loose gas cap, or a disconnected or cracked vapor hose. |
| P0128 | Coolant temperature below thermostat regulating temperature Usually a thermostat stuck open. Fix it to restore efficiency and cabin heat. |
| P0442 | EVAP system small leak Loose or worn gas cap, cracked hose or purge or vent valve. |
| P0301 | Cylinder 1 misfire Commonly a bad spark plug or ignition coil on that cylinder. |
| P0401 | EGR flow insufficient Clogged EGR passages or a stuck EGR valve. |
Got a check engine light on your I3 REX? A code is a clue, not a diagnosis, so we scan it and test the system before replacing anything. See our check engine light diagnostics.
Serious Incident Reports
Of the NHTSA complaints on file for the I3 REX, 2 involved a crash, 1 involved a fire. These numbers are drawn from self-reported complaints and are not verified findings. If your vehicle has an open recall, get it repaired promptly.
Keeping a BMW I3 REX Reliable in Phoenix
Arizona heat is the hardest test a BMW will face. Batteries, belts, hoses, tires and engine oil all wear faster here, and a I3 REX that spends its life in stop-and-go Valley traffic needs maintenance earlier than the owner's manual's normal schedule suggests.
Our recommendation for I3 REX owners: follow the severe-service schedule, test the battery before every summer, inspect brakes and tires twice a year, and have any warning light diagnosed instead of ignored. If you are shopping for a used BMW I3 REX, a pre-purchase inspection shows what the paperwork does not.
BMW I3 REX Services at EZ Swap LLC
Get the details on our Phoenix BMW I3 REX repair service, or choose a service below.
Auto Repair
All makes and models, from domestic trucks to imports.
Details →Battery Replacement
Test, replace and protect against Phoenix heat.
Details →Starter & Alternator Repair
Charging and starting system repair.
Details →No-Start Diagnostics
Find out why it will not start.
Details →Check Engine Light Diagnostics
Scan, test and pinpoint the real cause.
Details →Oil Change & Maintenance
Oil, filters, fluids, tires and scheduled service.
Details →BMW I3 REX FAQ
What are the most common problems with the BMW I3 REX?
Based on NHTSA owner complaints, the most-reported problem areas for the BMW I3 REX are power train (15), electrical system (12), fuel/propulsion system (11). Complaint counts reflect reports filed, not the share of vehicles affected.
Which I3 REX model years have the most complaints?
The I3 REX model years with the most NHTSA complaints on file are 2014, 2018, 2019. Older years have had longer to collect reports, so inspect any specific vehicle before buying.
What check engine codes are common on the BMW I3 REX?
NHTSA complaints rarely cite specific codes for the BMW I3 REX. On Phoenix vehicles in general, we see P0420, P0300 misfires, P0171 lean conditions and EVAP leaks such as P0455 and P0442 most often. Bring yours in and we will scan and test it.
Does the BMW I3 REX have any safety recalls?
NHTSA lists 0 recall campaigns for the BMW I3 REX across model years 2014, 2018 to 2021. Each recall applies only to certain vehicles, so enter your VIN at nhtsa.gov/recalls to see if yours is affected.
Do you repair the BMW I3 REX in Phoenix?
Yes. EZ Swap LLC repairs and maintains BMW vehicles including the I3 REX, at 9050 N 9th St in Phoenix. Call or text (602) 246-9063 for an appointment.
Is a pre-purchase inspection worth it for a used BMW I3 REX?
Yes. An inspection checks the engine, transmission, brakes, suspension, A/C and electrical system, and scans for stored codes, so you know the real condition before you buy.
How often should I service my BMW I3 REX in Phoenix?
Follow the severe-service schedule in your owner's manual, since heat and stop-and-go driving count as severe use. Test the battery before summer and inspect brakes and tires regularly.
More BMW Models We Service
Source: public complaint and recall records from the National Highway Traffic Safety Administration (nhtsa.gov). Counts reflect reports filed and do not predict the condition of any individual vehicle.