Question about 1999 Volkswagen Jetta

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1999 vw jetta cannot communicate with obd to pass emmissions Help! Just had cat replaced.

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If it can't communicate with it then replace the fuse. It could be blown. If the fuse is good then try disconnecting the battery for about an hour to reset the default values in the computer. It may not recognize the new cat. The last resort is taking it to the dealer to re-flash the drive. Good luck

Posted on Apr 23, 2009

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