Have a 2006-2007 Vios. Very bad fuel consumption and gutless power. Full tank can only go about 250-320 tops.
(Even worse than my 20yr+ 4age or my RB25 )

Checked the plugs and seems like they're fine and new. Any ideas ? Is this a common problem ? Its about 7xk millage only.

Thanks.

Just changed engine oil along with it.

Thanks will do so. Ill update if there's any changes/improvements.

Fixed it i suppose, just awhile only took out the dirty air filter and tested running the car without air filter by doing "sprints" around the road, feels like a new car again. Thanks, will get a replacement soon

I dreaded that it might be the air flow or O2 but just now took out the filters and gave it a run, seems to be better now. Power is there, F/C will have to wait for the results

Cleaned the MAF sensor aswell, was dirty as heck. Hopefully can get better f/c now.

As mentioned in my posts awhile back, tested the car after changing air filter and cleaned the dirty MAF sensor, regained power and f/c. Full tank about 400km+ now, just to let you guys know if there's bad f/c and gutless torque/power check your air filter and MAF sensor.

Yeah, you have to be careful with the sensor. I brought it to the mechanic and while waiting for the filter to arrive from the parts shop i opened up the MAF sensor just to have a look, and to my surprise its blardy dirty so i gave it to the mech and he cleaned it up for me.

I suppose its best to clean your MAF with a experienced mechanic since they have the right cleaner and tools and know what they're doing. Dont wanna screw up your MAF now do we.