My car (2003 Toyota) was having that 'check engine' light on and so went to some guys who I see advertising computerised diagnosis for help. They hooked their machine to the car's CPU and printed out the error code i. e. SVL error. I asked them the way forward they said that to 'solve' the problem we just had to delete the error code from the car's memory which they did and the light went off. That's when I realised they didn't know what they were doing. I mean deleting the message doesn't solve the problem. When I put them to task about their lack of knowledge they said the problem was the cylinder head gasket that needed changing. Then that the thermostat needed to be unplugged otherwise the car would overheat and melt the engine etc etc.

I didn't want them to touch the car again so I left and nearly refused to pay for their so called diagnosis. I called my mechanic and he refered me to some guy who did the diagnosis again. It was the same error code and he correctly interpreted the problem to be the solenoid valve. We changed the valve and the problem disappeared and the light went off. And it's now been six months of problem free motoring.

Be careful who you consult since many mechanics have that diagnosis gadget nowadays but few know to interprete the error codes.

Please give the name and contacts of this good diagnosis guy.