Waiting for a car part to completely fail can lead to expensive repairs, unexpected breakdowns, and even safety hazards. At Select Auto Parts & Sales, we’ve helped thousands of Milwaukee drivers catch warning signs early and replace failing parts before they turn into bigger problems.
If you’re wondering how to know when something on your car is about to go bad, here’s a detailed breakdown of what to listen for, look for, and check.
1. Listen for Unusual Noises — They Matter
Cars make all kinds of sounds, but new or strange noises are often early signs of part failure.
Brakes Squealing or Grinding?
- A high-pitched squeal usually means your brake pads are worn and metal wear indicators are rubbing.
- If you hear grinding, the pads may be completely worn, and the rotors might already be damaged.
Engine Knocking or Ticking?
- A deep knock could signal rod bearing failure, which needs immediate attention.
- A light ticking noise could mean low oil or a failing lifter.
Suspension Clunking When You Hit Bumps?
- You could be dealing with worn ball joints, control arm bushings, or damaged shock absorbers.
🔧 Pro Tip: Pay attention to when the noise happens—while accelerating, turning, or braking. That info helps diagnose the issue faster.
2. Check for Leaks — And Know What Fluid Is What
Seeing fluid under your car? Here’s how to identify it:
Engine Oil (Dark brown/black, slick)
- Common sources: Valve cover gasket, oil pan, rear main seal
- Risk: Low oil levels can lead to engine overheating or complete engine failure
Coolant (Bright green, pink, or yellow with a sweet smell)
- Often leaks from the radiator, hoses, or water pump
- Risk: Overheating can blow a head gasket or warp your engine
Transmission Fluid (Red/brown, thick)
- Leaks usually from transmission pan or cooler lines
- Risk: Leads to poor shifting or total transmission failure
🚗 Small leak? You can use a stop-leak additive temporarily—but don’t skip the proper repair.
3. Watch for Performance Changes — They Can Be Clues
Sluggish Acceleration?
- May point to a clogged fuel filter, failing fuel pump, or dirty MAF sensor
Rough Idling or Frequent Stalls?
- Check for bad spark plugs, ignition coils, or vacuum leaks
Loose Steering or Vibration at High Speeds?
- Could be due to worn tie rod ends, wheel bearings, or misalignment
4. Inspect Wear-and-Tear Parts Before They Fail
Some parts follow a predictable wear cycle. Replace them before they leave you stranded:
- Timing Belt: Replace every 60,000–100,000 miles
If it breaks, it could destroy your engine - Serpentine Belt: Cracks or fraying mean it’s time to replace
This belt powers vital components like your alternator and A/C - Battery: If older than 3–5 years, test it regularly
Cold weather is especially hard on weak batteries
5. Don’t Ignore Dashboard Warning Lights
Your dashboard lights are early warning systems. Here’s what the most common ones mean:
Check Engine Light (CEL)
- Might be something minor like a loose gas cap
- Or serious like a failing catalytic converter
Tip: Most auto parts stores will scan your CEL for free
ABS Light
- Usually means a wheel speed sensor or hydraulic unit is failing
- Affects your anti-lock braking system—don’t ignore it!
Final Tip: When In Doubt, Let the Experts Check It
If you’re unsure whether a part needs replacing, don’t guess. Bring your vehicle to Select Auto Parts & Sales for a free inspection. Our experienced team can spot worn parts early and recommend cost-effective solutions—including high-quality used auto parts.
🔧 Need a reliable replacement part today?
📞 Call Select Auto Parts & Sales at 414-710-8617
🔗 Click here to browse our live inventory
Whether you need an affordable replacement part or just want a second opinion—we’re here to help Milwaukee drivers stay safe and save more.