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Top 10 most expensive mistakes in car repair

5. Telling your mechanic what to replace

Heino Kalis/Reuters/File
Renault Formula One driver Vitaly Petrov of Russia talks to a mechanic during the second free practice session before the European F1 Grand Prix in Valencia, Spain, last year. Don't assume you know what your car's problem is.

  • By Ray Cox Contributor

Assuming you know what鈥檚 wrong with your vehicle could lead to needless repair and more money out of your pocket. For example, you may be convinced that your car needs new spark plugs or an engine tuneup, when you really need the MAF (mass air flow) sensor cleaned. If you tell your mechanic to replace the spark plugs instead of asking him to diagnose the problem, he will do it and charge you for it, leaving you with the same unresolved issue. 

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