The emission light came on as my son drove the car to the last drop of petrol, how can I turn off the light? swift 2006

Yes
2006 Suzuki swift fuel light Google Search

hello welcome to USA forum fixya.!
the swift is not sold here, (my nephew has one with 1.3L in South America now, just drove it last week. )
tiny front wheeled car sold everywhere, but USA.
why not post symptoms first.
ask for diagnosis.?
the car has no carb, or any jets.
its and EFI injected engine, sold in many size engines world wide.
many are 1.5L , M15a engines, some are VVT valve timed.
so, what's up doc?
me eating carrot......munch munch....

here is the wiki list for 2005 generation.
1.2 L I4 (petrol)
1.3 L M13A I4 (petrol)
1.5 L M15A I4 (petrol)
1.6 L M16A I4 (petrol)
1.3 L I4 (diesel)

2006 petrol Swift 1.5 litre engine has a cam CHAIN and only needs replacement when engine is overhauled. If you do have a toothed rubber cam belt then normal replacement is 80,000km to 100,000km

which engine?
gen 3 swift had these engines.
1.2 L I4 (petrol)
1.3 L I4 (petrol)
1.5 L I4 (petrol)
1.6 L I4 (petrol)
1.3 L I4 (diesel)
so which one? never work on any car engine, until you know what's there. if I open my hood and look up, there is a sticker there states ENGINE in this car, but that is USA< other countries, have stickers on fire wall or ?
if in USA the VIN has the engine code, but you never stated country.
suz has like 55 engines. but above is for swift.

emission? you mean the SES or CEL? lamp ? check engine. or service engine,? lamp.
the car is under warranty for 8 years, take it in.
you could scan it with a scanner and if EVAP is failing
tighten the gas cap, reset the DTCs and lamp is now out.
and drive. top failure on all cars 1996 to now, is, loose gas cap.

old post, but Ill answer for others. with same issue, belts.
Timing.
no country stated. so.... ?
what engine.? there are 56, and many cars have 8 engines used
on one brand car.

I live in the USA< and go to to any store that sells GATES belts.
Napa is my best store,
and GATES has a full kit ,with the best belt and a new idler.
suzuki real parts , only in USA and Canada is Suzuki shutting down. (some parts sources do remain open, no all,)

your car, a Generation 2 swift
had , 5 engines offered world wide, says wiki, 1sec search
1.2 L I4 (petrol)
1.3 L I4 (petrol)
1.5 L I4 (petrol)
1.6 L I4 (petrol)
1.3 L I4 (diesel)

which might you have.???

Bad gas maybe, maybe junk in tank from bad gas or it could b the cadalidic converter

it will be fine in a garage.

Is there any service engine lights on ? is it always or just, hot /or cold what is the miles on it , and have you had any maintenance done. in last year or two? / it could be some thin very simple, like plugged air filter/bad temp sensor/or fuel filter / or just Warren out spark plugs / but all this is just a guess unless we can git a little more info. if no service engine light, then i would start with basic tune up maintenance/ least expensive first/ last of all it does sound as tho it could be a clogged catalytic converter,[ But a clogged fuel filter will too.] so i am not advocating any thin expensive/ only to start with basic maintenance first that may salve your concern/please let us know if this is helpful and please if we can be of any further assistance feel free to ask. Thank You.

Try changing the fuel filter.