Hey Guys

Ive been driving my car a while i know the suspensions out of wack a bit got new springs just need new rear sway bar bushes probably gonna get them made at a machine shop as i cant get them from a supplier.

My cars averaging about 17l/100km which i think is way too high i dont drive ridiculously fast or open throttle ive reset the computer just today it was reading 17 after about 6 hours on the clock it was still reading 17 so i dont know maybe the o2 sensor needs replacing i thought the suspension and tyres would cause a little more fuel consumption till i get them fitted but 17 seems ridiculous. 02 sensor an expensive item to replce and how do you test it.

What car do you have?

AWD or fwd
Manual or auto
What percentage city versus highway driving do you do


This should allow people to give some more accurate feedback.

my 2004 TW vrx manual does 12.5L-12.7L/100km with 80%city, 20%highway driving with fwd 6g74

The computer may not be accurate. What does the average speed say?
Best way to test consumption is to fill the car right to the lip of the filler, drive til you've used half a tank or more, refill and do the calculations (Total fuel Litres divided by kilometres x 100).

I give my car a fair hiding with 50/50 highway and city driving, through hills daily etc and still average around 10-11 with an average speed around 45km/h.

TJ Ralliart Auto

02 sensor an expensive item to replce and how do you test it.
I don't know what current pricing for the OEM oxygen sensor is but I paid around $140 (including postage) for one about 4 years ago.

The simplest way to test the oxygen sensor is:
- disconnect sensor (connector is on passenger side of tunnel near the ECU)
- disconnect the battery briefly (10-20s should be more than enough) to reset the ECU
- take the car for a reasonable drive and assess the behaviour and fuel economy

If the fuel economy improves with the oxygen sensor disconnected then further investigation of the sensor is warranted. If there's no change, reconnect the sensor (with the ignition OFF!) and look elsewhere for the problem.