Things You Should Know About VAG-COM renault can clip v120

For those who don't have much knowledge about auto repair, they may wonder what is VAG-COM as it's  renault can clip v120 frequently mentioned in auto diagnosis. Actually it's a kind of diagnostic tool.
What is VAG-COM?
The definition given by Wikipedia says that VAG-COM, officially known as VCDS, is an acronym for VAG-COM Diagnostic System, which is a third party Microsoft Windows-based software that primarily used for diagnostics and adjustments of Volkswagen Group motor vehicles, including Volkswagen Passenger Cars, Audi, SEAT and Skoda automobiles, along with Volkswagen Commercial Vehicles.
How to use VAG-COM?
When apply this software in auto repair, you need other supplementary tools to connect your PC with the car. The most popular ones are VAG Commander and USB KKL
Auto repairers choose elm 327 for it can apply most diagnostic requests. It covers all electronic control units in vehicles and allows managing of brand new immobilizer units. But its most important usage is to read DTC and change odometer value.

As for USB KKL, I recommmend you renault can clip v120 Terminal K means bus of communication and Terminal L equals to ignition for waking up car computing system. But you should note that this diagnostic cable is usable for ISO9141 and KWP 2000, not for a protocol or bussystem like VPW, PWM or CAN-bus.
After connecting via diagnostic cables, VAG-COM start to work. It converts the two K lines smartly and uses the latest PIN/SKC to match the keys equipped with mobilize anti-thief system. You can observe three data streams at the same time. Then you can spot all the trouble codes of your cars.