Car Diagnostics
17 articles on car diagnostics.
Car DiagnosticsWhy Does My Car Shake or Stall When the AC Is On?
A car that shakes or stalls when the AC kicks on usually has an idle problem the compressor's load exposes, or a worn engine mount. How to tell which, and the costs.
Car DiagnosticsWhy Does My Car Sound Like a Lawn Mower?
A car that suddenly sounds like a lawn mower almost always has an exhaust leak, a stolen catalytic converter, or a misfire. How to tell which, and what each costs.
Car DiagnosticsCar Sounds Like It's Dragging Something? What That Scraping Noise Means
A scraping or dragging sound while driving is usually a bent brake dust shield, a loose splash guard, a dragging caliper, or a rock. How to find it in five minutes.
Car DiagnosticsCar Won't Start After Getting Gas? Here's the Usual Culprit
A car that cranks but won't start right after a fill-up almost always has a stuck-open EVAP purge valve, a cheap fix. How to confirm it in two minutes and the cost.
Car DiagnosticsWhy Does My Car Sound Like a Helicopter?
A helicopter-style whop-whop from a car is usually cupped tires, a failing wheel bearing, or a loose exhaust part. How to tell which in five minutes, and the costs.
Car DiagnosticsWhy Does My Car Smell Like Burning Oil or Rubber?
A hot oily smell usually means a leak dripping onto the exhaust. A rubbery smell means a slipping belt or dragging brake. How to tell which one you have.
Car DiagnosticsGrinding Noise When Turning: Common Causes and Repair Costs
A grind when turning usually means a wheel bearing, CV joint, or worn brakes. How to tell which one it is in five minutes, and what each repair typically costs.
Car DiagnosticsWhy Is My Steering Wheel Shaking When I Brake?
A shake only under braking is almost always the front rotors. Most pad-and-rotor repairs run $260 to $580 per axle. How to check it yourself before you book.
Car DiagnosticsWhat Does White, Blue, or Black Exhaust Smoke Mean?
The color of your exhaust smoke tells you which fluid is burning: white is coolant, blue is oil, black is fuel. What each one costs to fix, and when it is urgent.
Car DiagnosticsWhy Is My Car Idling Rough or Stalling at Stops?
A rough idle is almost always air, fuel, or spark, and most fixes land between $100 and $500. How to narrow it down yourself, and when stalling becomes a safety issue.
Car DiagnosticsWhy Is My Car Shaking at Highway Speed? Causes & Costs
Highway-speed shaking is usually unbalanced wheels, often a $60 to $130 fix, but tires, alignment, and worn suspension can cause it too. How to tell which.
Car DiagnosticsBrakes Squeaking or Grinding? What Each Sound Really Means
Morning squeaks are usually harmless surface rust; grinding means metal-on-metal. How to tell which sound you're hearing and when it's unsafe to keep driving.
Car DiagnosticsCar Overheating? What to Do in the First 60 Seconds
What to do in the first 60 seconds when your car overheats, the mistake that causes severe burns, and repair costs from a $20 cap to a $3,000 head gasket.
Car DiagnosticsDead Battery or Bad Alternator? How to Tell in 5 Minutes
The free headlight and jump-start tests that separate a dead battery from a bad alternator, and what each repair actually costs at independent shops.
Car DiagnosticsCar AC Blowing Hot Air? Recharge vs. Compressor vs. Condenser
Why your car's AC blows hot air: refrigerant leaks, compressor, or condenser failures, with real costs from $150 recharges to $1,800 compressor jobs.
Car DiagnosticsWhy Won't My Car Start? Clicking, No Crank, or Crank-No-Start
Rapid clicking usually means a weak battery, one loud click points to the starter, and crank-no-start means fuel or spark. What to check first, plus real costs.
Car DiagnosticsCheck Engine Light On? Here's What to Do
Steady vs. flashing check engine lights explained, the most common OBD-II codes (P0420, P0300, and more), and the exact steps to take in the next 10 minutes.
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