Understanding dashboard warning lights in your BMW E90 is essential for maintaining vehicle safety, as they alert you to potential issues that could lead to breakdowns or accidents if ignored. By recognizing these symbols promptly, you can take appropriate actions to prevent costly repairs and ensure the car operates reliably. This knowledge empowers drivers to address problems early, enhancing overall vehicle longevity and road safety.
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Red Warning Lights (Stop Immediately)
These lights indicate serious issues requiring you to stop the vehicle safely and seek immediate assistance to avoid damage or danger.
Engine Oil Pressure
Low oil pressure can cause engine damage from lack of lubrication. Possible causes include low oil level or pump failure. Stop driving, check oil, and add if needed; consult a mechanic right away.
Brake System Alert
Signals low brake fluid or hydraulic system failure, risking brake loss. Causes may be leaks or worn pads. Pull over safely and call for roadside help without driving further.
Engine Coolant Temperature
Engine is overheating, which could lead to severe damage. Causes include low coolant or radiator issues. Stop immediately, let it cool, and check coolant level before proceeding.
Battery Charging System
Battery isn’t charging properly, possibly due to alternator failure. This can cause electrical shutdown. Stop and have the system inspected to prevent stranding.
Airbag Warning
Airbag system fault, meaning airbags may not deploy in a crash. Causes include sensor or wiring issues. Stop and get it fixed at a service center for safety.
Transmission Fault
Transmission overheating or malfunction, risking gear failure. Causes could be low fluid or sensor problems. Stop driving and tow to a repair shop.
Steering System
Power steering failure, making steering difficult and unsafe. Possible causes are fluid leaks or pump issues. Pull over and seek professional help immediately.
Diesel Particulate Filter (DPF)
Filter is blocked, potentially causing engine damage in diesel models. Exhaust buildup is the main cause. Stop and visit a service center for cleaning or replacement.
Brake Fluid Low
Low brake fluid level, which can lead to brake failure. Leaks or wear are common causes. Stop safely and top up fluid or get it checked.
Seatbelt Reminder
Driver or passenger seatbelt is unbuckled, increasing injury risk in accidents. Simply fasten the belt to resolve; if it persists, check sensors.
Door Ajar
A door is not fully closed, posing a safety hazard while driving. Check and secure all doors; if the light stays on, inspect latches.
ABS Failure
Anti-lock braking system is faulty, reducing braking control. Sensor or module failure is typical. Stop and repair to restore safe braking.
ESP/DSC Failure
Electronic stability program is off or faulty, affecting traction. Wiring or sensor issues cause it. Pull over and diagnose at a shop.
Glow Plug (Diesel Models)
Glow plugs aren’t heating properly for cold starts, risking engine strain. Faulty plugs or wiring. Stop and replace them before further use.
Yellow/Amber Warning Lights (Action Required Soon)
These lights signal issues that need attention soon to prevent escalation, but you can usually continue driving cautiously.
Check Engine
Engine or emissions system fault, like sensor issues or misfires. Causes vary from fuel cap to major problems. Schedule a diagnostic check soon.
Tyre Pressure
One or more tires have low pressure, affecting handling and fuel efficiency. Underinflation or punctures cause it. Inflate tires promptly and monitor.
Coolant Level
Coolant is low, risking overheating if ignored. Leaks or evaporation are causes. Top up coolant and check for leaks soon.
Service Vehicle Soon
Vehicle is due or overdue for maintenance. Mileage or time-based reminder. Book a service appointment to address it.
Diesel Exhaust Fluid (DEF)
DEF level is low in diesel models, affecting emissions. Refill the tank soon to avoid reduced engine power.
Bulb Out
A light bulb, like headlamp or brake light, is faulty. Burnout is the cause. Replace the bulb to ensure visibility and safety.
Fuel Cap
Gas cap is loose or missing, causing evaporation issues. Tighten or replace it; if light persists, check seals.
Lane Departure
System detects unintended lane drifting, but may need calibration. Sensor dirt or faults cause it. Clean sensors and recalibrate soon.
Frontal Collision Warning
Alerts for potential front-end crash risk, but system may be faulty. Clean sensors or have it checked to restore function.
Start/Stop System
Automatic engine stop/start is malfunctioning. Battery or sensor issues. Service it to regain fuel efficiency benefits.
Air Suspension Fault
Suspension system has a problem, affecting ride height. Leaks or compressor failure. Get it inspected before long drives.
Water in Fuel Filter (Diesel)
Excess water in fuel system, risking engine damage. Contaminated fuel causes it. Drain the filter and refuel from a reliable source.
Engine Air Filter
Air filter is dirty, reducing engine performance. Clogging from dust. Replace the filter during your next service.
Green Warning Lights (Information Only)
These lights provide status updates on active systems or features, requiring no action unless they indicate a problem.
Turn Signal
Indicates turn signals are active for changing direction. Flashes when in use. No action needed unless it fails to turn off.
High Beams
High-beam headlights are engaged for better distance view. Manual or auto activation. Dim them for oncoming traffic.
Daytime Running Lights
Lights are on automatically during daytime for safety. System-controlled. No action; they enhance visibility.
Fog Lamp Indicator
Front or rear fog lamps are active for low visibility. Switch-activated. Turn off in clear conditions.
Automatic Headlamp Dimmer
System is auto-adjusting headlamps for conditions. Sensor-based. No intervention required.
High Beam Assistant
Auto high-beam control is on, switching beams as needed. Works with cameras. Override manually if preferred.
Cruise Control
Cruise control is set and maintaining speed. Driver-activated. Adjust or deactivate as driving changes.
Eco Mode
Eco driving mode is enabled for better fuel efficiency. Reduces power usage. Switch off for more performance.
Parking Lights
Parking lights are on, often with sidelights. Used when parked. Turn off to avoid draining battery.
Indicator Lamp
General system status light, like for accessories. Informs of active features. Monitor for changes.
Short-Beam Headlights
Low-beam headlights are on for normal driving. Standard operation. No action needed.
When looking at BMW, make sure to check out our guides on models like the BMW X3, BMW X1, BMW 2 Series, and BMW i3. Understanding dashboard warning lights is essential. Our expert reviews break down what each light means, highlighting common alerts for these models and what they could signal about underlying issues, so you’re never left guessing behind the wheel.