I bought GMC yokun 2007 model. I have checed it in MY GMC agency and they confirmed its OK. After a While I got permmenant ODB-II alarm on steady light display. I took it to GMC agency again. They check and release the alarm, but it comes again. I really warried about it. Could anybody advise me what to do?
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You must connect an ODB-II code reader to determine what codes are stored (which will also indicate what has failed in your car that caused the Check Engine light to illuminate). Once you have repaired the defects, the ODB-II code reader may be used to reset the stored code condition.
Probably the first and best next step wold be to have an ODB II diagnostic readout of all engine and transmission, (because engine radiator cools its fluid) alarms to help determine if you have a real issue or just a faulty sensor. Most other paths without this data would be a shot in the dark.
VW rabbit 2007 has electronic power steering so you have to send it for diagnostic testing on an ODB II tester. It is the only way you going to pick up that intermittent fault. The error code on the diagnostic tester will reveal what is causing the problem. But go check out http://volkswagen-polo-highline.blogspot.com/ to see how this gets done.
I think you need to post a little more information for someone to be of help. Cam Position Sensor and Crank Position Sensor problems are not uncommon on these cars (although you see more Crank Position Sensors go than Cam). Replacing them is not too difficult, if you have some mechanical skill. Just make sure your problem really is with the sensor before you start replacing parts. The sensors cost between $60 and $175 (depending on which and where you purchase it). If you have a specific code that you pulled from an ODB II reader, then start with that. If your check engine light is on, but you don't have an ODB II reader, then try your local parts store. Most will read codes for free.
Some local car parts stores will let you borrow an ODB II diagnostic reader so you can find out what the computer is complaining about; others will even run the test for free because they hope to sell you the repair parts. Until you do that, we have no idea what is going on unless there are other noticeable symptoms.