Handheld OBD2

I have one & it only works on 2006 Subaru, tried on earler & wont work works on BA falcon & later, BT50/ford courier. Thats the ones ive used it on at this stage.

Unless you understand what your doing; a scan tool can be a waste of money and cheap on's IMO are not worth the money.

Scan tools will in most cases will not tell you what is wrong and without knowledge they can cause a lot of headaches.

A scan tool is like a street directory, it will point you in the supposedly right direction but it will not tell you anything about the buildings on the street.

The best one to get is one that can read raw data and data log.

There is not one scan tool that's the best at everything.

Not much can go wrong with O2 sensor circuits other then the sensor it's self.

Unless you can read the live data from the sensor or measure the voltage a scan tool will tell you nothing you don't already know.

As s rule of thumb a O2 sensor Is only good for about 100,000k.