4 parts covered
Modern vehicles have complex electrical systems controlling everything from engine management to comfort features. Electrical components are increasingly common failure points as vehicles become more computerized.
The car battery stores electrical energy to start the engine and power accessories when the engine is off. Modern batteries are maintenance-free sealed units that typically last 3-5 years.
Total Cost
$100 – $300
Lifespan
3 – 5 years
DIY Difficulty
If It Fails
The alternator generates electricity to power all electrical systems and recharge the battery while the engine is running. Without a functioning alternator, the battery will drain and the car will die.
Total Cost
$300 – $800
Lifespan
100,000 – 150,000 miles
DIY Difficulty
If It Fails
The starter motor is an electric motor that cranks the engine to start it. When you turn the key or press the start button, the starter engages with the engine flywheel and spins it fast enough for combustion to begin.
Total Cost
$300 – $700
Lifespan
100,000 – 200,000 miles
DIY Difficulty
If It Fails
The Mass Airflow Sensor measures the volume and density of air entering the engine, allowing the computer to calculate the correct amount of fuel to inject. It's critical for proper engine performance and emissions.
Total Cost
$150 – $400
Lifespan
100,000 – 200,000 miles with proper air filter maintenance
DIY Difficulty
If It Fails