Parts Guides

Pencil ignition coils and automotive coil pack modules
Can an Auto Parts Store Test an Ignition Coil?
Some auto parts stores can scan diagnostic trouble codes and may offer limited bench testing for certain removable ignition coils, but services and equipment vary by location. A code scan... Read more...
Pencil ignition coils and automotive coil pack modules
What Are the Symptoms of a Bad Ignition Coil?
A failing ignition coil can cause engine misfire, rough idle, hard starting, hesitation, weak acceleration, poor fuel economy and a check-engine light. Failures may appear only when the engine is... Read more...
Automotive spark plugs in common electrode and insulator styles
Iridium vs. Platinum Spark Plugs: Which Are Better?
Iridium spark plugs generally offer a finer, more erosion-resistant center electrode and often support longer service intervals than standard platinum plugs. Platinum plugs remain durable, affordable and correct for many... Read more...
Automotive spark plugs in common electrode and insulator styles
What Are the Symptoms of Bad Spark Plugs?
Common bad spark plug symptoms include rough idle, hard starting, hesitation, weak acceleration, engine misfire, reduced fuel economy and an illuminated or flashing check-engine light. These symptoms are not exclusive... Read more...
Brake rotors including vented, drilled and slotted disc designs
Drilled vs. Slotted Brake Rotors: What Is the Difference?
Drilled rotors use holes through the friction ring, while slotted rotors use machined channels across its surface. Both can help manage water, gases and surface debris in demanding use, but... Read more...
Automotive starter motors and solenoid assemblies
How Long Does a Car Starter Last?
A car starter often lasts roughly 80,000 to 150,000 miles, but start cycles matter more than road miles. Many units last the life of the vehicle, while frequent short trips,... Read more...
Automotive starter motors and solenoid assemblies
What Are the Symptoms of a Bad Starter?
Bad starter symptoms include a single click with no cranking, intermittent no-crank, slow cranking despite a charged battery, grinding, free-spinning or whirring, and smoke or a burning smell during start... Read more...
Automotive alternators in multiple housing and pulley configurations
Bad Alternator vs. Bad Battery: How Can You Tell?
A bad battery often causes slow cranking after the vehicle sits, while a bad alternator often causes the battery to lose charge while driving or soon after a jump-start. Symptoms... Read more...
Automotive alternators in multiple housing and pulley configurations
What Are the Symptoms of a Bad Alternator?
Common bad alternator symptoms include a battery warning light, dim or flickering lamps, repeated battery discharge, slow electrical accessories, whining or grinding noises, burning odor and eventually an engine that... Read more...
Automotive alternators in multiple housing and pulley configurations
How Long Does an Alternator Last?
An alternator commonly lasts about 80,000 to 150,000 miles, or roughly seven to ten years, but it has no fixed replacement interval. Heat, bearing wear, battery condition, belt drive, fluid... Read more...
Automotive engine air filters in panel, rectangular and round styles
Washable vs. Disposable Engine Air Filters: Which Is Better?
Disposable paper filters are usually the simplest, lowest-maintenance choice for daily drivers and provide predictable filtration when replaced on schedule. Washable filters can reduce repeat purchases and may suit owners... Read more...
Automotive engine air filters in panel, rectangular and round styles
What Happens If Your Engine Air Filter Is Dirty?
A moderately dirty engine air filter may cause no obvious symptom because modern engine controls compensate for changing airflow. As restriction becomes severe, the vehicle can lose high-load power, respond... Read more...
Automotive engine air filters in panel, rectangular and round styles
How Often Should You Change Your Engine Air Filter?
Change the engine air filter at the interval in the owner’s manual and sooner when inspection shows excessive dirt, damage or sealing problems. Many vehicles call for inspection around routine... Read more...
Spin-on and cartridge automotive oil filters with seals
Synthetic vs. Conventional Oil Filters: What Is the Difference?
“Synthetic oil filter” usually describes filter media made partly or largely from synthetic fibers; it does not mean the filter contains synthetic oil. Synthetic or blended media can offer high... Read more...
Spin-on and cartridge automotive oil filters with seals
Does It Matter What Oil Filter You Use?
Yes. An oil filter must fit and seal correctly, provide the intended flow, use the proper bypass-valve behavior and last the vehicle’s full service interval. Two filters that look alike... Read more...
Spin-on and cartridge automotive oil filters with seals
How Often Should You Change Your Oil Filter?
Replace the oil filter at every engine-oil change unless the vehicle manufacturer explicitly specifies otherwise. Follow the owner’s manual for the oil-change interval, oil grade and severe-service schedule. Modern intervals... Read more...
Pencil ignition coils and automotive coil pack modules
Should You Replace All Ignition Coils at Once?
You do not always need to replace every ignition coil when one fails. Replacing only the confirmed failed coil is often reasonable on a lower-mileage vehicle when the others test... Read more...
Mechanical automotive water pumps with impellers and gaskets
How Long Does a Water Pump Last?
Many water pumps last about 60,000 to 100,000 miles, but design and drive method matter. Timing-belt-driven pumps are often replaced with the belt at the manufacturer’s scheduled interval; chain-driven, serpentine-driven... Read more...
Mechanical automotive water pumps with impellers and gaskets
What Are the Symptoms of a Bad Water Pump?
Bad water pump symptoms include coolant leaking near the pump or weep hole, overheating, temperature fluctuation, grinding or whining, pulley wobble and steam or coolant odor. Electric pumps may fail... Read more...
Automotive aluminum radiators in multiple core and tank configurations
How Long Does a Car Radiator Last?
A car radiator often lasts eight to ten years or longer, but there is no universal mileage interval. Coolant maintenance, corrosion, pressure cycles, road debris, plastic-tank aging, vibration and overheating... Read more...
Automotive aluminum radiators in multiple core and tank configurations
Can a Car Radiator Be Repaired or Should It Be Replaced?
A radiator may be repairable when damage is small, accessible and the rest of the unit is sound. Replacement is usually better for cracked or brittle plastic tanks, multiple leaks,... Read more...
Automotive aluminum radiators in multiple core and tank configurations
What Are the Symptoms of a Bad Radiator?
Bad radiator symptoms include visible coolant leaks, repeated coolant loss, overheating, corrosion or damaged fins, cold spots from internal blockage, contaminated coolant and poor cabin heat related to low coolant.... Read more...
Automotive starter motors and solenoid assemblies
Starter or Battery: Why Won’t My Car Start?
Slow or rapid-clicking cranking commonly points to a weak battery or poor connection; one solid click with bright lights can point toward the starter circuit. Neither pattern is conclusive. Check... Read more...
Upstream and downstream automotive oxygen sensors with wiring leads
Upstream vs. Downstream Oxygen Sensors: What Is the Difference?
An upstream oxygen or air-fuel-ratio sensor sits before the catalytic converter and helps the engine computer adjust mixture. A downstream sensor sits after the converter and primarily monitors catalyst performance.... Read more...
Upstream and downstream automotive oxygen sensors with wiring leads
How Long Do Oxygen Sensors Last?
Heated oxygen sensors commonly last around 100,000 miles, while older unheated designs may have shorter expected lives. Many manufacturers do not specify preventive replacement, so the owner’s manual controls. Heat... Read more...
Upstream and downstream automotive oxygen sensors with wiring leads
What Are the Symptoms of a Bad Oxygen Sensor?
Bad oxygen sensor symptoms can include a check-engine light, poor fuel economy, rough running, failed emissions testing and rich or lean fuel-trim behavior. Many vehicles show no obvious drivability change,... Read more...
Automotive fuel injectors with fuel rail and replacement seals
Fuel Injector Cleaning vs. Replacement: Which Do You Need?
Cleaning can help an injector restricted by removable deposits, especially when professional flow testing confirms an uneven spray or reduced delivery. Replacement is the better choice for electrical failure, cracked... Read more...
Automotive fuel injectors with fuel rail and replacement seals
How Long Do Fuel Injectors Last?
Fuel injectors often last 100,000 miles or more, and many remain serviceable for the life of the vehicle. There is no universal replacement interval. Fuel quality, filtration, heat, deposits, electrical... Read more...
Automotive fuel injectors with fuel rail and replacement seals
What Are the Symptoms of Bad Fuel Injectors?
Bad fuel injector symptoms include rough idle, cylinder misfire, hesitation, hard starting, poor fuel economy, fuel odor, smoke and a check-engine light. A clogged injector may deliver too little fuel,... Read more...
In-tank fuel pump modules and inline automotive fuel pumps
Can a Bad Fuel Pump Cause a Car Not to Start?
Yes. A failed fuel pump can let the engine crank normally without starting because the injectors lack required pressure or volume. It is only one possible cause. A relay, fuse,... Read more...
In-tank fuel pump modules and inline automotive fuel pumps
How Long Does a Fuel Pump Last?
An in-tank electric fuel pump often lasts 100,000 miles or more, and many last the life of the vehicle. There is no routine universal replacement interval. Running very low on... Read more...
Mechanical automotive water pumps with impellers and gaskets
Should You Replace the Water Pump With the Timing Belt?
Yes, when the water pump is driven by the timing belt or sits behind the same covers, replacing it during scheduled timing-belt service is often sensible and commonly recommended. Labor... Read more...
In-tank fuel pump modules and inline automotive fuel pumps
What Are the Symptoms of a Bad Fuel Pump?
Bad fuel pump symptoms include long cranking, crank-no-start, hesitation or power loss under load, surging, stalling, unusually loud tank whining and low measured fuel pressure or volume. A clogged filter,... Read more...
Beam, hybrid and conventional automotive windshield wiper blades
How Often Should You Replace Windshield Wiper Blades?
Windshield wiper blades commonly need replacement every six to twelve months, but condition matters more than the calendar. Replace them sooner when they streak, chatter, skip, split or leave unsafe... Read more...
Automotive halogen and LED-style replacement headlight bulbs
How Long Do Headlight Bulbs Last?
Typical halogen headlight bulbs may last roughly 500 to 1,000 operating hours, while factory HID bulbs often last longer and factory LED systems can last many thousands of hours. Actual... Read more...
Automotive halogen and LED-style replacement headlight bulbs
LED vs. Halogen Headlight Bulbs: Which Are Better?
LED technology can use less power and last longer, while halogen bulbs are inexpensive, simple and correctly focused in headlamps designed for them. An LED retrofit bulb is not automatically... Read more...
Automotive halogen and LED-style replacement headlight bulbs
What Headlight Bulb Does My Car Need?
Find the correct headlight bulb through the owner’s manual, the marking on the removed bulb and an application catalog using the full year, make, model, trim and headlamp option. Confirm... Read more...
Complete automotive strut assemblies and bare replacement struts
Shocks vs. Struts: What Is the Difference?
Shocks and struts both damp spring motion, but a strut is also a structural suspension member that helps locate the wheel and often carries the coil spring and upper steering... Read more...
Automotive shock absorbers in monotube and twin-tube configurations
How Long Do Shock Absorbers Last?
Shock absorbers are often inspected closely around 50,000 miles, but they do not have a universal replacement deadline. Some wear sooner from rough roads, towing and corrosion, while others remain... Read more...
Automotive shock absorbers in monotube and twin-tube configurations
What Are the Symptoms of Bad Shock Absorbers?
Bad shock absorber symptoms include excessive bouncing, nose dive, rear squat, body roll, unstable or floating highway behavior, cupped tire wear, clunking and visible fluid leakage. Springs, bushings, ball joints,... Read more...
Beam, hybrid and conventional automotive windshield wiper blades
Beam vs. Conventional Wiper Blades: Which Are Better?
Beam wiper blades use a curved spring structure without exposed frame joints, helping maintain pressure and resist snow packing. Conventional blades use an articulated metal or plastic frame and are... Read more...
Beam, hybrid and conventional automotive windshield wiper blades
What Are the Signs You Need New Wiper Blades?
Replace wiper blades when they leave persistent streaks or haze, skip, chatter, squeak on wet glass, miss sections, split at the edge or show bent frames and loose adapters. First... Read more...
Automotive air conditioning compressors with clutch pulleys
A/C Compressor Clutch vs. Compressor Failure: How Can You Tell?
A failed A/C clutch may prevent an otherwise healthy compressor from turning, while internal compressor failure may create poor pressure, noise, seizure or metal contamination even when the clutch engages.... Read more...
Automotive air conditioning compressors with clutch pulleys
What Are the Symptoms of a Bad A/C Compressor?
Bad automotive A/C compressor symptoms include warm or inconsistent air, grinding or knocking when A/C is requested, a clutch that will not engage, belt squeal, refrigerant or oil leakage and... Read more...
Automotive air conditioning compressors with clutch pulleys
How Long Does a Car A/C Compressor Last?
A car A/C compressor often lasts eight to twelve years or 100,000 miles or more, but there is no fixed replacement interval. Refrigerant leaks, low oil circulation, contamination, condenser airflow,... Read more...
Unbranded automotive catalytic converters replacement parts on a dark studio background
Can You Drive With a Bad Catalytic Converter?
Driving with a mildly inefficient converter may be possible briefly, but a restricted, rattling, overheating or glowing converter can cause stalling, fire risk and engine damage. A flashing check-engine light,... Read more...
Unbranded automotive catalytic converters replacement parts on a dark studio background
How Long Does a Catalytic Converter Last?
A catalytic converter is designed to last at least 100,000 miles and often lasts the life of the vehicle. It normally has no routine replacement interval. Misfire, rich fuel mixtures,... Read more...
Unbranded automotive catalytic converters replacement parts on a dark studio background
What Are the Symptoms of a Bad Catalytic Converter?
Bad catalytic converter symptoms include a check-engine light with efficiency codes, failed emissions testing, loss of power from restriction, rattling substrate, excessive heat and sulfur-like exhaust odor. Oxygen-sensor faults, exhaust... Read more...
Unbranded automotive wheel bearings replacement parts arranged on a dark studio background
Should You Replace Both Wheel Bearings at the Same Time?
You do not automatically need to replace both wheel bearings when one fails. Replacing only the confirmed bad side is usually reasonable because bearings fail independently. Replacing both may make... Read more...
Unbranded automotive wheel bearings replacement parts arranged on a dark studio background
How Long Do Wheel Bearings Last?
Many sealed wheel bearings last 85,000 to 150,000 miles or more, but there is no universal service interval. Impacts, water intrusion, corrosion, incorrect axle-nut torque, oversized wheels and installation damage... Read more...