Lexus IS250 Alternator Repair at your home or office.

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Alternator Repair Estimate for Lexus IS250

Lexus IS250 Alternator Repair costs $370 on average. Following is a breakdown of the labor and parts estimates.

YourMechanic Price
$319 to $618
Labor: $112 -$144
Parts: $207 -$474
Average Dealer price
$567 to 1122
Average Shop price
$396 to 748
Get an instant quote for your car
Our mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing
Get a quote
CarServiceEstimateShop/Dealer Price
2009 Lexus IS250V6-2.5LService typeAlternator RepairEstimate$549.76Shop/Dealer Price$700.37 - $1051.69
2007 Lexus IS250V6-2.5LService typeAlternator RepairEstimate$567.76Shop/Dealer Price$713.77 - $1061.64
2013 Lexus IS250V6-2.5LService typeAlternator RepairEstimate$557.44Shop/Dealer Price$704.68 - $1047.68
2015 Lexus IS250V6-2.5LService typeAlternator RepairEstimate$1060.96Shop/Dealer Price$1342.78 - $2087.93
2014 Lexus IS250V6-2.5LService typeAlternator RepairEstimate$670.96Shop/Dealer Price$847.15 - $1293.71
2012 Lexus IS250V6-2.5LService typeAlternator RepairEstimate$539.44Shop/Dealer Price$677.72 - $1013.98
2008 Lexus IS250V6-2.5LService typeAlternator RepairEstimate$549.76Shop/Dealer Price$698.55 - $1048.51
2011 Lexus IS250V6-2.5LService typeAlternator RepairEstimate$539.44Shop/Dealer Price$682.46 - $1022.29
Show example Lexus IS250 Alternator Repair prices

Service

What is an alternator and how does it work?

The alternator, which is bolted to the engine, keeps your car’s battery charged and produces the electrical power necessary to run the vehicle’s electrical systems. When starting your car, stored energy in the battery powers the starter motor. Once the engine is running, the alternator produces the electrical energy that your car needs by spinning a magnet on a rotor through a stationary coil of wire. To ensure that the alternator provides the right voltage output for your car’s electrical system, there is a voltage regulator built into the alternator. The voltage regulation is built into the car’s Powertrain Control Module (PCM) on newer vehicles.

Alternator

When to replace the alternator?

The following electrical or mechanical faults are signs that the alternator may need to be replaced:

  • Battery or charging system warning light. If a warning light has illuminated, the charging system and the vehicle battery should be tested to pinpoint the fault.
  • Difficulty starting your car or it doesn’t start. A faulty alternator will lead to the battery being discharged. Once the battery has discharged enough, you will have difficulty starting your car or it won’t start at all.
  • Dimming lights. Should the alternator have an internal electrical fault, such as a burned-out diode or open stator windings, the alternator will have less capacity to provide electrical power.
  • Grinding or whining noise. High heat created by the engine dries out the grease in the alternator bearings, wear occurs, and then the alternator can emit a grinding or whining noise as it spins. Certain electrical failures within an alternator can also cause a whining noise.
  • Premature Battery Failure. If the voltage regulator within the alternator has failed, and thus charging system output is too high, that can cause the battery to fail due to overcharging. Although this fault is not as common as a weak alternator, the possibility should always be considered if your car battery fails prematurely.
  • On an annual basis, or every 12,000 miles. The voltage output of the alternator should be carefully measured and compared to the OEM factory specification. Voltage output should also be checked whenever the vehicle battery is replaced.

How do mechanics replace an alternator?

  • Disconnect the battery prior to replacing the alternator, as with all electrical repairs.
  • Unhook the drive belt connected to the alternator.
  • The electrical connections to the alternator are removed and the alternator is unbolted from its cradle on the engine.
  • The new alternator is installed while observing all factory bolt torque specifications. Alternators have to be mounted to the engine very securely because they rotate at high speed. Electrical connections are cleaned and re-attached, including the connections to the battery.
  • While the drive belt is off, best practice is to inspect the drive belt as well as inspect all pulleys driven by the belt.
  • Once all components are securely in place, the vehicle engine is run and the output of the new alternator is measured and verified against the OEM factory specification.

Is it safe to drive with an alternator problem?

One should exercise caution. Should the alternator fail while you are driving, the battery alone will power the car’s electrical system for a short while. Cars require a substantial amount of electrical power though and the battery will likely discharge relatively quickly. The car may stall and it would be impossible to re-start if the battery discharged completely. When the battery or charging system warning light illuminates, the situation should be investigated and resolved as soon as possible.

When replacing the alternator keep in mind:

  • An alternator should always be tested to be sure it is actually faulty versus a circumstance where faulty electrical connections, or an open fuse, might be the problem.
  • An alternator that has noisy or worn out bearings should be replaced regardless of electrical test results.
  • A properly functioning battery is very important in modern cars and consequently the battery should be load tested when the alternator is replaced.
  • Alternators are designed to power all vehicle electronics and maintain a fully charged battery but if the battery has failed and won’t hold a charge, attempting to continually re-charge such a battery by driving can overload the alternator. Replace the battery and avoid repeatedly jump-starting your car.
  • Electrical connections, including grounds, are very important in the charging system. When replacing the alternator, all disconnected terminals should be inspected and cleaned and then checked to be sure all connections are properly tightened.

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Excellent Rating


YourMechanic Lexus IS250 Alternator Replacement Service

Average Rating

5/5

Number of Reviews

9

Rating Summary
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Meet some of our expert Lexus mechanics

Real customer reviews from Lexus owners like you.

Rusty

20 years of experience
242 reviews
Rusty
20 years of experience
Rusty did a quick and informative job. It's great to see how a true professional works in this Day and age. Keep up the good work Rusty. We need more like you. Thanks....
2006 LEXUS IS250 - ALTERNATOR - GRAND PRAIRIE, TEXAS

Michael

22 years of experience
136 reviews
Michael
22 years of experience
I own a 2007 Lexus IS250 my alternator went out on Christmas eve. I shopped around for quotes for a couple of days your mechanic gave me a quote for almost half of what others were asking! So I booked. Michael Showed up and got right to work! Me and my husband were VERY impressed with his work! I am very picky with my car, but i will definitely be using your mechanic and Michael again.
2007 LEXUS IS250 - ALTERNATOR - LAS VEGAS, NEVADA

Shaun

13 years of experience
238 reviews
Shaun
13 years of experience
Shaun did an excellent job replacing the alternator. He is knowledgeable, efficient, and friendly. Great first experience with YourMechanic.com and I can definitely recommend Shaun.
2007 LEXUS IS250 - ALTERNATOR - REDWOOD CITY, CALIFORNIA

Joseph

17 years of experience
238 reviews
Joseph
17 years of experience
Great service friendly knowledgeable. I will definitely be using their sevices again.
2007 LEXUS IS250 - ALTERNATOR - SOUTH JORDAN, UTAH
Get an instant quote for your car
Our mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing
Get a quote
CarServiceEstimateShop/Dealer Price
2009 Lexus IS250V6-2.5LService typeAlternator RepairEstimate$549.76Shop/Dealer Price$700.37 - $1051.69
2007 Lexus IS250V6-2.5LService typeAlternator RepairEstimate$567.76Shop/Dealer Price$713.77 - $1061.64
2013 Lexus IS250V6-2.5LService typeAlternator RepairEstimate$557.44Shop/Dealer Price$704.68 - $1047.68
2015 Lexus IS250V6-2.5LService typeAlternator RepairEstimate$1060.96Shop/Dealer Price$1342.78 - $2087.93
2014 Lexus IS250V6-2.5LService typeAlternator RepairEstimate$670.96Shop/Dealer Price$847.15 - $1293.71
2012 Lexus IS250V6-2.5LService typeAlternator RepairEstimate$539.44Shop/Dealer Price$677.72 - $1013.98
2008 Lexus IS250V6-2.5LService typeAlternator RepairEstimate$549.76Shop/Dealer Price$698.55 - $1048.51
2011 Lexus IS250V6-2.5LService typeAlternator RepairEstimate$539.44Shop/Dealer Price$682.46 - $1022.29
Show example Lexus IS250 Alternator Repair prices

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1-800-701-6230 · hi@yourmechanic.com