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My 2000 Saturn SL2 has OBD communication problems and white smoke from the tailpipe. Should I have the dealership fix it?

Our Saturn SL2 year 2000 failed the smog test due to OBT communication failure plus white smoke coming out. We just had the severe oil leak fixed (oil filter was loose for a long time) prior to failed smog test. Where will we bring it? to the dealer GMC...do we really have to have the computerized engine diagnostics before it can be diagnosed? Finances are so limited so any little bit of help/advice will be appreciated.
Answer:

I think the problems you are describing first need a general mechanic to get the vehicle up to speed. Fine tuning the emissions system if the vehicle doesn't pass the first test after the general mechanic is done with it, can be diagnosed by a smog check repair center. The labor rate at a general repair shop is going to cost much less (though you should confirm this with the shop) then a certified smog check repair station. Just note that no money spent at a general repair center can be used towards your deductible if you decide to apply to the State Repair Assistance Program CAP. White smoke may indicate a defective head gasket. White smoke is basically steam, and is caused by water seepage into the combustion chambers. Water may be entering the combustion chambers through the head gasket where the engine's valve head and engine block connect. This will cause white smoke coming out of your car's exhaust tailpipe. Just note that excessive white smoke is normally emitted typically on cold days, and when the engine is not properly warmed up. White smoke during startup or during cold weather is just steam, and will not cause a smog test failure. posted by SmogTips Support

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