The diagnostic socket is at the lower edge of the dashboard on the driver's side.
Idling speed with automatic gearbox
550–800 rpm550–800 rpm550–800 rpm
Idling speed with manual gearbox
550–800 rpm550–800 rpm550–800 rpm
Minimum engine oil temperature at VET
176°F176°F80°C
expand_morePetrol exhaust gas values
CO content at idling speed
0.5 %0.5 %0.5 %
CO content at increased idling speed
0.3 %0.3 %0.3 %
Ignition time
-10°00'±2°00' - before TDC + after TDC
Increased idling speed
2500–3000 rpm2500–3000 rpm2500–3000 rpm
Lambda sensor design
Jump type lambda sensor
Lambda value
0.97–1.03 λ0.97–1.03 λ0.97–1.03 λ
Maximum HC content at idling
100 ppm100 ppm100 ppm
Test speed for lambda sensor signal
550–800 rpm550–800 rpm550–800 rpm
Voltage swing at test speed
0.4 V0.4 V0.4 V
(More than).
To reduce environment impact and pass government inspections keep emission parameters at the level prescribed by Toyota.
Please be noted that all capacities listed here are approximate. Check fluid levels when adding or refilling as recommended in your 2003 Toyota Prius user's manual. Keep in mind that all information here is provided “as is” without any warranty of any kind.
Before doing any DIY service please check your insurance policy and Toyota warranty policy for your region. In some regions DIY service may invalidate your warranty.
DIY car service is not as difficult as it looks like and it might save you thousands of dollars per year. It might be even fun and a good thing to do with your kids on a weekend to teach them how basic machinery works. It's really hard to screw something up and damage your car permanently if you use right tools, follow Toyota Prius service manual and use right parts and fluids in prescribed amounts. Even modern cars stuffed with electronics can be serviced in your garage or even in your driveway. Changing engine oil, brake fluid, ATF, replacing brake pads, and etc. It's all may be done by yourself in a mater of a couple of hours.
Doing basic service for your 2003 Toyota Prius you're not only saving money, but also also improving your technical skills and learning something new.
2003 Toyota Prius generations
In 2003 Toyota offered 2 generations of the Prius. Emission may vary in different generations. Be sure that you are looking at the rigt modification.