Question about 2005 Volkswagen Jetta

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Overboost condition 2005 jetta TDI W/ BEW engine. Engine will go into limp mode and throw a overboost code when you get into higher gears. All sensors are checking out fine, Thought it was a map/boost sensor but a new one did no good. All started after a new turbo was installed.

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  • dusty142ehrl May 29, 2009

    Thanks that was it

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  • 79 Answers

Hello, your car is probaly a variale vane turbo fitted and all you need to do is seperate the VNT part of the turbo, give it a good clean with brake/carb cleaner get rid of the sticky oily residue which makes the vanes stick on turbo causing a overboost fault, a delearship might tell you that your car has been remapped at some time setting the boost RPM at like 14 or 1500 and it should be like 2200 I do not know the specifics on your vehicle but a good auto manual will tell you at which RPM your boost should build. I would have a diagnostic done and see if this is your problem, if so do the above and go back and see if it fixed your overboost problem. If not, you will need your ECU remapped. I hope this fixes your problem!

Posted on May 27, 2009

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Posted on Jan 02, 2017

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