stlgrym3

iTrader: (4)

the car cranks very slow before it starts. i just noticed this today. the car is almost 4 years old, is this a battery issue or something more serious?

509IS350

iTrader: (5)

Get the battery tested at any Wal-Mart or Autozone.

Offspring

iTrader: (3)

Lexus warranties their battery for 3 years. It might be time to get a new one

aznlexus

Check your battery to see if it is 12V. If it's below 12V, you would need a new battery. Sometimes starter is also an issue, so make sure you check the starter too

Keppie

Do the diagnostics then replace the battery regardless of what the disgostics say. A 4 year old battery is ripe for dyinng at any moment.

vicsis250

Battery issue for sure, is your brake peddel hard sometimes in the morning too? That will be caused low battery or low amps. Call AAA they will test it and give you a better warranty then lexus

stlgrym3

iTrader: (4)

i was battery issue. the car die on me this morning. replaced with a new battery, it's all good now. i had to remove the outer battery bracket in order to connect my new battery up perfectly. i noticed the OEM Panasonic battery is smaller, therefore it needs that plastic bracket.

debor300

We put a Battery Brain on our battery, comes with a fob. Now we kill the battery every time we turn off the engine by clicking the FOB. No problems with the parasitic leak however the clock has to be reset each time. The battery brain is used at marinas on motor boats. It got too hard to find the battery drain after to put $1000 in thinking we fixed the issue.

2013FSport

iTrader: (2)

Your engine life and fuel economy will suffer slightly as the car will need to relearn fuel trims and shift points every time its been disconnected.

To bad you couldn't resolve the real issue.
GL

2013FSport

iTrader: (2)

Can you explain in detail what all was done? Do you have skills or patience to do any digging yourself.

The MPX B computer has caused many parasitic loss issues. Cheap on fleebay but hard to point the fingers at and may not bear fruit with the shot gun approach.