I brought a LAUNCH plug in code reader to work out the fault codes on my cars via the iPhone and clear the engine warning lights. Its a great thing that does many things , problem is I have no idea what I am doing as far as using the plug in as well as how to read what is right and what is wrong with the car. Its great that you can look at lots of things , do reports on lots of things and take screen shots and do all sorts of things with it. Does anyone have any experience with the LAUNCH unit or know how to apply what they say the fault codes are so that I can fix the damn thing. Its a 2008 VE v6 and I had codes P0430 - Cat system low efficiency Bank 2 P2273 - O2 sensor rich lean I managed to clear these faults and after about half an hour of operation P2273 fault came back up again. A mate gave me this information - Heated Oxygen Sensor (HO2S) 2 , bank 2 - signal stuck rich. Possible causes wiring , HO2S , fuel pressure , injectors , air intake restricted. I have mechanical experience on older cars and access to basic hand tools and multimeters , pressure gauges and lots of other tools but I have no idea where to even start. I don't even know where the HO2S is or the wiring. I need to get a rego inspection and it wont pass while the check engine light is on. Can anyone help?