Check engine light code 25

Which of 3 engines>??????????????????????????
the car is useless with a bad battery, EFI needs a battery that works.
end story.? AMAZING QUESTION THAT. ?
like asking how to drive with a flat tire., ...????
battery fixed, and charge, and alternator good,, 13.3 to 15v running.
reset the CODE, drive and it comes back sure, it will.

Code 25 and Code 26 Air fuel ratio fault (for ES300 SC300 models)

that is the meaning, the cause is huge.
the tests near endless for old cars, with OBD1,
No scan tools. make it harder.
the car has 3 engines. none stated, and each can work different.
so I PASS on lean. checks, no enigne stated.
why are you working on an engine you dont know what it is?

lean can can mean. (basics)
1: its really lean. (lots of causes, ask lots of tests ask)
2: or the 02 sensors are bad. (front sensors)

or there are exhaust cracks allowing fresh air to enter the exhaust any where near the 0xy sensors.
this will cause (shows lean) the PCM to force max rich, because the PCM believes this lie, and goes rich to compensate, and does so grossly.

those are the basics.
I can tell you that the PCM never ever never, knows what part is bad.
it only reports 2 things,
1: bad readings from sensors.
2: or bad monitors, the above means the fuel trim is WAY OFF the charts. A monitor is like a nanny, she, watches all the time and reports things that are odd. (its a passive monitor , only the EFI code is in control , injection and spark)

Engine Code 25, Air-Fuel Ratio Lean Malfunction.

it could be ther are many causes for this code and you must check for vacumm leaks.