What does a red dashboard light mean?

Red dashboard lights indicate serious issues that require immediate attention. These include oil pressure, engine temperature, and brake system warnings. Pull over safely and address the issue before continuing to drive.

Can I drive with the check engine light on?

A steady check engine light is usually safe for short drives but should be diagnosed soon. A flashing check engine light indicates a serious problem — reduce speed and have the vehicle checked immediately.

How do I reset dashboard warning lights?

Some lights reset automatically after fixing the issue. Others require an OBD-II scanner to clear the code. Always diagnose and fix the underlying problem before attempting to reset any warning light.

What Does Forward Collision Warning (FCW) Light Mean?

Reviewed by automotive technicians · Last updated July 21, 2026

Quick Answer

Forward Collision Warning (FCW) Light = The Forward Collision Warning system uses radar and camera sensors to detect vehicles or obstacles ahead. When the system calculates that a collision is imminent and the driver has not braked, it illuminates this warning and sounds an alert. This is a driver-assist feature — it warns but does not brake for you (unlike Automatic Emergency Braking). If the light stays on continuously, the FCW system may have a sensor malfunction.
Severity: Warning · System: Nissan Altima (2019-2025)

DRIVE WITH CAUTION — Repair Soon

The Forward Collision Warning system uses radar and camera sensors to detect vehicles or obstacles ahead. When the system calculates that a collision is imminent and the driver has not braked, it illuminates this warning and sounds an alert. This is a driver-assist feature — it warns but does not brake for you (unlike Automatic Emergency Braking). If the light stays on continuously, the FCW system may have a sensor malfunction.

What you see: An orange or red icon showing two vehicles from the side with a collision indicator, often accompanied by an audible chime and the text 'Forward Collision Warning' on the instrument display

What to Do Right Now

If the light flashes with an audible alert, apply the brakes immediately — a collision is imminent. If the light stays on continuously without an obstacle ahead, the FCW system has a malfunction and should be diagnosed. You can continue driving — the vehicle is safe to operate, but the collision warning system will not function. Check if the front radar sensor (behind the front bumper) is blocked by snow, mud, or debris.

Repair Cost Estimate

Option	Est. Cost	Notes
Do It Yourself	$0 (cleaning the radar sensor); $50-100 for a replacement sensor bracket if physically damaged	If you have basic tools and mechanical knowledge
Mechanic / Dealer	$120-200 diagnostic; $300-600 for radar sensor replacement; $200-400 for camera recalibration	Includes diagnostic labor + parts

About This Data

Dashboard warning light information compiled from Nissan owner's manuals, OEM service documentation, SAE J2402 standards, and NHTSA guidance. This is an independent reference — not affiliated with or endorsed by Nissan. All brand names, model names, and dashboard symbols are trademarks of their respective vehicle manufacturers.

Published: 2026-07-21 · Repair costs are national averages and vary by location. Always get multiple quotes before authorizing repairs.

⚠️ Red dashboard lights demand immediate action — continued driving may cause engine damage or brake failure. When in doubt, pull over and consult a certified mechanic.

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Frequently Asked Questions

Can I drive my Nissan Altima with the Forward Collision Warning light on?

Yes — the vehicle is safe to drive, but the forward collision warning system will not function. Exercise extra caution and maintain safe following distances. If the light is flashing with an audible alert, brake immediately to avoid a collision. If the light is steady, the system has a malfunction and should be diagnosed at your convenience.

How much does it cost to fix the Forward Collision Warning light on a Nissan Altima?

DIY cost estimate: $0 (cleaning the radar sensor); $50-100 for a replacement sensor bracket if physically damaged. Mechanic/dealer estimate: $120-200 diagnostic; $300-600 for radar sensor replacement; $200-400 for camera recalibration. Nissan dealers have the specialized calibration equipment needed for FCW sensor alignment — do not attempt sensor replacement without proper calibration tools.

What causes the Forward Collision Warning light to come on in a Nissan Altima?

Common causes: the front radar sensor is blocked by snow, ice, mud, or heavy rain; the sensor is misaligned after a minor collision or bumper replacement; the windshield camera is misaligned after windshield replacement; or the system has an internal electronic fault. In winter, snow and ice buildup on the front bumper is the #1 cause — clear the sensor area and the light should reset after a few driving cycles.