Amber Engine block outline with CHECK text Light: Check Engine Light Warning Light
⚠️
Check Soon (Solid) / Stop Immediately (Flashing)
The Engine Control Unit (ECU) has detected a fault in the engine management or emissions system.
📋 What This Light Means
| Light Color | Amber |
| Symbol | Engine block outline with CHECK text |
| Meaning | The Engine Control Unit (ECU) has detected a fault in the engine management or emissions system. |
| Urgency | Check Soon (Solid) / Stop Immediately (Flashing) |
🛑 What to Do When This Light Comes On
Step 1: If steady: check gas cap is tight; if not resolved within 1-2 days scan for codes. If flashing: pull over immediately and shut off engine — catalytic converter damage occurring.
⚠️ What happens if you ignore this light: Ignoring a solid CEL can turn a $100 oxygen sensor into a $2500 catalytic converter replacement. Ignoring a flashing CEL can cause engine fire risk.
🛠️ Technician's Notes: The most misunderstood warning light. Solid = diagnose soon. Flashing = STOP NOW. This light alone tells you nothing — you need the OBD2 code for diagnosis.
📚 Data Sources: Warning light information compiled from SAE J2402 dashboard symbol standards, NHTSA vehicle safety regulations, OEM owner's manuals, and ASE master technician field experience. Different vehicle makes may display slightly different symbols. Always consult your owner's manual for make-specific warnings.