Skip the auto shop - Our mechanics make house calls

Q: Starting problems - 2004 Lexus LS430

asked by on

the car battery was low however there was enough charge to start the car then it died right away. then the juice ran out. We put the booster on the care and it started then died right away.

My car has 200000 miles.
My car has an automatic transmission.

Hi there. This sounds like a case of a failed alternator & battery duet. Many times these can fail within close time frames of each other and are usually recommended to be replaced together so that it has a new battery with a new alternator (unless one has recently been replaced).

A digital battery tester can provide data such as battery health, state of charge, cold cranking amps, and whether or not it may have a bad cell. A load tester can help determine if the alternator has failed. One of the most common things I used to look for at that Lexus dealer was a valve cover leak that had been dripping onto the alternator. Almost every time the oil leaking from the valve cover had seeped into the alternator and the result was a failed alternator.

If this is the case, the valve cover gaskets should definitely be replaced as the leaking oil will cause the new alternator to fail. If you would like to have this taken care of, YourMechanic hast professional technicians that can assist you with a diagnosis of the starting problem, and can also follow through with a battery replacement, alternator replacement, and valve cover gasket replacements services as necessary.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: Battery dying and both alternator and battery passed for good when inspected

If the battery passes a load test and charging system output has been measured and is within specifications, the only reason a battery will discharge is if the car sits for a long period of time (batteries will self-discharge even...

Q: No crank when hot

The PCM supplies power to the purple/white wire which activates the starter relay. I would disconnect that wire from the PCM, mostly likely it would need to be cut somewhere it can be easily repaired or you will need to...

Q: Not shifting into overdrive

This transmission is electronically shifted. Possible causes of no overdrive include a faulty transmission range switch, valve body, faulty overdrive brake, or faulty ECM. Faults codes should be read out with a scanner, and statuses read. You may want to...

Related articles

How Do Power Car Windows Increase Passenger Safety?
Power windows are responsible for approximately 2,000 emergency room visits every year. When a power window closes, it exerts enough force to bruise or break bones, crush fingers, or restrict an airway. Though...
What are the Car Pool Rules in Hawaii?
Hawaii is widely regarded as a land of vacation and relaxation, and as such, its scenic roads and routes are far better known than the state’s freeways. But, as with all...
P2103 OBD-II Trouble Code: Throttle Actuator Control Motor Circuit High
P2103 means there is a fault with the throttle actuator control motor circuit, likely due to a defective electrical component or part.