Last time I read TomJ no longer does this job. I think your only options are to either find a local diesel injection shop or buy an injector tester and do it yourself. First though, I'd try some Diesel Purge.

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2004 VW Jetta TDI (manual)

Past MB's: '96 E300D, '83 240D, '82 300D, '87 300D, '87 420SEL