Toyota voxy becomes heavy ones an eco like dissapear at normal spead.and the car also becomes normal ones the eco light appear.and now da eco light is not appearing as it was previousily.so the car is heavy as if it is pulling something but ones the eco light appear it becomes light as usual.in addition to when ,my car was norma da eco light were dissappearing when da speed is more than 90 km/hr but now da eco light is dissapering even at 20km/hr and da car becomes heavy ,what are da likely problem?

You don't state country assuming AU...ck heere...

https://autoparts.beforward.jp/search/TOYOTA/VOXY/?gad=1

if NOT AU please advise.

Fix your car right away, by clicking the link toyota voxy

https://www.google.com/search?rlz=1C1CHBF_enUS699US699&biw=994&bih=440&tbm=isch&sa=1&q=+toyota+voxy+location+of+fuel+rail+pressure+sensor&oq=+toyota+voxy+location+of+fuel+rail+pressure+sensor&gs_l=psy-ab.3...18956.28729.0.31413.6.6.0.0.0.0.136.675.1j5.6.0....0...1.1j2.64.psy-ab..0.5.570...0j0i8i30k1j0i8i7i30k1.0.4BoG4GiW69c

for heavy machinery cars etc. luckily there are many websites
that can help you repair
for eg site like reliable-store is very active in this.. instant help, emails and all that's fantastic

You need to have the fault codes read using an OBD2 fault code reader.

How many litres of oil for toyota voxy 2.0 engine Kufa, 4.2L of oil with a filter or 4.0L without filter change.
Check the attached links,instruction and guides, Good luck
"I hope this helped you out, if so let me know by pressing the helpful button. Check out some of my other posts if you need more tips and info."

Toyota VOXY Solving Car Problems

Toyota Noah Voxy 2001 2007 Guide to repair and maintenance Page 4 Catalog...

http://autorepman.com/en/toyota/3422-toyota-noah-voxy-2001-2007-engine-repair-manual.html

I'm not familiar with your vehicle but I'm surprised that a mechanic can't find the fuel filter!
The link below will show you generic images of fuel filters:
fuel filter Google Search

Usually the fuel filter is 'inline' .. a fuel hose clips on one side as the inlet and on the other as the outlet. Quite often the filter is greyish/silver in colour and may be about the size of a coke can.

Get under your vehicle. Follow the fuel line from the fuel tank towards the engine. Chances are you'll see it underneath the car .. you're looking for a cylindrical metal container..

Most fuel filters are fitted inline underneath the vehicle. It shouldn't be difficult to find

No there is no option to do that.

make TUNE -UP and RUN the scanner/compute for easy diagnostic and fix it.
God bless you

two things:

1. dont drive the car when engine light signaling....must be a error in engine
2. speed sensor is probably placed in wheeldrum or in gearbox.