You can buy a scanner at your local Pep Boys and use it. Or, you can get a ScanGauge . It will tell you what codes is making your checkengine light turn on. Once you've read the code, just go to the internet and it will tell you which codes, what is the problem, and most important, how to fix it. The advantage is that you take out the guessing factor. Know which part or parts to change and how expensive it will be.

 

You are apparently nto aware, that the European model doesn't actually have a OBD port under the dash.

 

Sorry, I'm not Walter Mercado (A local psychic) but for my next trick mate, here are the next numbers of the PowerBall with $900,000,000,000.00.

5, 15, 68, 99, 25, 33

 

Well, at least, as you say; "direct you to the system/circuit with the fault". It's a lot cheaper then a (not you of course) mechanics that will try to take you for a ride. At least it can help you narrowing it down or at least have an idea. Many mechanics, when they scene ignorance, they scene money. I've read many members who have had this problem. Spending more then they have to. Slight knowledge of the area or part can help. This happen a lot with senior citizens.

 

I've got a 1998 Toyota Rav4 3dr Freesport and it doesn't have OBD2, It's got the old school interface which is under the bonnet. Those with OBD2 (I think some 1998 models and all Later models), the port can be found under the steering wheel inside the car under one of the covers by your knees.