⚠️ Read This First
Every year, thousands of DIY mechanics suffer preventable injuries. This checklist is designed to cover the essentials — not every edge case. Your safety is the number one priority. If something doesn't feel right, stop and reassess. No project is worth your life.
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1. Workspace Setup
Before any work begins — prepare your environment
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Work in a well-ventilated area — open garage doors or use a fan. Never run an engine in an enclosed space. Critical
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Ensure adequate lighting — use a work light or headlamp so you can clearly see every connection and component you're handling.
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Clear the workspace of clutter, grease, and slip hazards. Keep walkways clean. A slip under a lift can be catastrophic. Critical
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Park on a flat, level, solid surface. Use wheel chocks on the wheels that remain on the ground.
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Keep the area free of flammable materials (paper, rags, gasoline containers) when working with sparks or heat. Critical
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Ensure children and pets are away from the workspace while you're working. Important
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Have a first aid kit nearby and accessible. Know its contents.
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Check that fire extinguisher is charged and within arm's reach. Use a Class B or ABC-rated extinguisher. Critical
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2. Personal Protective Equipment (PPE)
Your first line of defense against injury
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Wear safety glasses or goggles at all times. Debris, chemicals, and snapping cables can cause permanent eye damage. Critical
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Use mechanic's gloves — cut-resistant for sharp parts, chemical-resistant for fluids. Change gloves if contaminated.
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Wear closed-toe, steel-toe shoes. No sandals or flip-flops. Dropping a wrench or jack stand on your foot is no joke. Critical
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Avoid loose clothing, ties, dangling jewelry, or anything that can catch in moving parts. Critical
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Tie back long hair and wear a cap or bandana to keep it secured.
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Use a respirator or mask when working with brake dust, sanding, exhaust components, or spray painting. Important
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Wear ear protection when using loud power tools (impact wrenches, air compressors, grinders).
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3. Vehicle Preparation
Safely prepare the vehicle before working on it
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Engage the parking brake (emergency brake) fully before any work. Critical
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Place the vehicle in Park (automatic) or first gear / reverse (manual). Critical
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Disconnect the negative battery terminal before working on electrical systems, airbags, or near high-voltage components (hybrids/EVs). Critical
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For hybrids/EVs: Verify high-voltage system is deactivated using manufacturer procedures. Do NOT guess — look up the specific procedure. Critical
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Allow the engine and exhaust to cool completely before starting work. Burns from hot surfaces are extremely common. Critical
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Check that fluids are not dangerously hot (coolant, power steering, transmission). Pressure-relieve radiator caps only when cool. 💡 Coolant can remain scalding for hours after shutdown.
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Release brake system pressure before disconnecting brake lines or calipers. Important
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Have the correct service manual or repair guide open and ready. Know what you're doing before you start. Recommended
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4. Lifting & Supporting the Vehicle
The most dangerous part of DIY — get this right
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Never get under a vehicle supported only by a jack. Always use jack stands rated for the vehicle's weight. This is the #1 cause of DIY fatalities. Critical
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Use at least two jack stands — one on each side. Place them at manufacturer-specified lift points. Critical
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Inspect jack stands before use — check for cracks, bent pins, worn surfaces, or loose components. Replace if damaged. Critical
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Inspect the hydraulic floor jack — check for leaks, damaged cylinders, or worn lifting pads. Important
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After placing on jack stands, give the vehicle a firm shake test to confirm stability before going underneath. Critical
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If using a two-post or four-post lift, verify it is inspected and rated for your vehicle's weight. Check safety locks engage properly. Critical
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Never exceed the weight rating of any jack, stand, or lift. Know your vehicle's weight and compare. 💡 Find your vehicle's curb weight online or in the owner's manual.
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Have a second person available when lifting heavy components or working under the vehicle. Recommended
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5. Tools & Equipment Safety
Use the right tool, the right way, every time
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Use the correct tool for every job. Never use a screwdriver as a pry bar, pliers as a wrench, or the wrong size socket. Critical
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Inspect tools before use — cracked handles, worn socket teeth, damaged ratchet heads, or frayed cords should be repaired or replaced. Important
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Use a torque wrench for critical fasteners — wheel lug nuts, cylinder head bolts, suspension components. Overtightening causes failures. Critical
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Keep electrical tools and extension cords away from water and fluids. Use GFCI outlets. Check cords for damage. Important
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When using compressed air (impact guns, blow guns), wear safety glasses. Never point at yourself or others. Use a nozzle guard. Critical
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Disconnect batteries and power tools before changing bits, blades, or accessories. 💡 "Lock-out, tag-out" isn't just for factories.
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Store sharp tools and loose bolts properly when not in use. A dropped wrench from height can seriously injure someone. Recommended
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6. Chemical & Fluid Safety
Handle automotive fluids and chemicals with care
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Never mix incompatible chemicals — especially battery acid, drain cleaners, and brake fluid. Read labels carefully. Critical
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Dispose of used oil, filters, and fluids properly. Take to an auto parts store or recycling center. Never pour down drains or on ground. Critical
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Wear chemical-resistant gloves when handling oil, brake fluid, coolant, gasoline, or adhesives. Important
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Keep all chemicals in original labeled containers with Safety Data Sheets (SDS) accessible. 💡 Never transfer chemicals into food/drink containers.
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Keep a spill kit or absorbent pads on hand for fluid spills. Contain spills immediately to prevent slip hazards and environmental damage.
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Store gasoline and flammable liquids in approved containers, away from heat sources and sparks. Critical
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Wash hands thoroughly after working with automotive chemicals — even if wearing gloves. Some chemicals absorb through skin. Recommended
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7. System-Specific Safety
Extra precautions for high-risk systems
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Airbag / SRS systems: Disconnect battery and wait at least 15 minutes (some manufacturers recommend 30) before working near airbags, steering columns, or dash components. Critical
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Brake systems: Never introduce moisture or oil to brake components. Bleed brakes according to specification. Contaminated brakes can cause total brake failure. Critical
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Exhaust work: Ensure exhaust is cool. Watch for carbon monoxide — never run the engine indoors or without proper exhaust routing. Critical
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Steering & suspension: These systems are under high pressure and tension. Never loosen components while the wheel is off the ground unless you understand the forces involved. Important
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Fuel system: Relieve fuel pressure before disconnecting lines. Keep sparks and flames away. Use a fire extinguisher nearby. Critical
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Radiator / coolant: Never remove the radiator cap on a hot engine. Coolant is under pressure and can spray at 200°F+. 💡 If the engine is hot, wait at least 2-3 hours or use the "two-finger test" on the upper hose — if hot, wait more.
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8. After Work & Completion
Finishing strong — don't skip the last steps
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Verify all fasteners are tightened to specification. Re-check torques after 50–100 miles for critical components. Critical
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Double-check nothing is left under or in the vehicle — tools, gloves, rags. A leftover wrench can cause catastrophic damage. Critical
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Lower the vehicle slowly and carefully — inspect clearance as it comes down.
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Reconnect the battery and verify all electrical systems are functioning (lights, warnings, accessories). Important
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Test the repair in a safe area — check brakes at low speed first, listen for unusual noises, verify steering response.
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Check fluid levels after the repair — oil, coolant, brake fluid, transmission fluid. Look for leaks. Important
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Clean up your workspace — dispose of waste properly, store tools, and sweep the area. A clean garage is a safe garage. Recommended
🚨 Emergency Information
🆘 Emergency Services
For life-threatening emergencies, fires, or serious injuries
911☠️ Poison Control
If you or someone ingests or is exposed to automotive chemicals
1-800-222-1222🔥 Fire Department
For garage fires, chemical spills, or electrical incidents
911🏥 Nearest Hospital
Know your closest ER location before starting any project
Check locally