If terminals are corroded, clean them with a baking soda paste and a brush. Tighten loose clamps.
If the alternator is the culprit, professional replacement usually runs between $300 and $500.
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Brakes, steering and suspension symptoms
Brake, steering, and suspension issues are safety-critical.
Squeals, grinding, shimmying steering wheels, uneven tire wear, and a car that pulls to one side each demand a focused diagnostic sequence.
Squealing typically indicates worn brake pads contacting a metal wear indicator. Grinding indicates the pads have worn through and metal-on-metal contact is occurring.
If you hear grinding, drive directly to a shop.
Steering wheel vibration at highway speeds usually signals an unbalanced tire. Vibration during braking usually points to warped rotors.
Uneven tire tread signals misalignment, incorrect pressure, or worn suspension components.
Suspension noises — clunks over bumps or a rough ride — indicate worn shocks, struts, bushings, or ball joints.
Wheel bearing failure presents as a humming or grinding that changes with speed.
Rotate tires every 5,000–7,500 miles. Inspect brakes at least every six months.
Follow seasonal checks for shocks and bushings.
Engine performance and fuel system problems
When an engine sputters, hesitates, or loses power, the culprit is often worn spark plugs, clogged fuel injectors, a dirty air filter, or failing O2 sensors.
Spark plugs wear with mileage and degrade combustion quality. Replacing them per manufacturer intervals restores crisp idle and throttle response.
Air filters are the simplest, cheapest fix: inspecting and replacing a clogged filter takes minutes.
Fuel injectors accumulate deposits that reduce spray quality. Periodic use of a fuel-system cleaner or professional injector cleaning restores atomization and efficiency.
A misfire that triggers a check engine code should be triaged with a code read before replacing parts.
O2 sensors and mass airflow sensors generate codes that point to rich/lean conditions.
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Emissions failures frequently stem from aging catalytic converters or failing sensors. Test upstream sensors and fuel trims first to avoid an expensive converter replacement.
