Advice please: V6 tdi 2.7 smoking

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Hello guys I live in Yorkshire, England

I have had my 2005 A6 Avant for over a year and really like the car as a daily driver

I am trying to find a remedy for an issue that started a few weeks ago, where I have noticed light grey smoke, especially after the car is warm and has done a few miles at highway speeds but then sits in traffic in towns and I notice the smoke. It can sometimes seem pretty bad, for example, when in traffic and 15-20 mph in 2nd gear, in those situations where it has warmed up.

I searched forums for ideas and found a number that suggested injector issues. However, a local mechanic refused to look at the car and suggested fuel pump failure/debris and told me to get rid of it. The car drives well, shows decent fuel economy, and the oil level appears perfect. I would appreciate any advice. The car has just passed 100k miles and a full history.

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Check the trim values on Measure Blocks 72-77 using VCDS; there is an Audi TSB that explains how the first value for each injector should not be more than -45, and the second value should not be more than -15 ms (i.e., bad is -60 and -20 ms). Quite often, these values aren’t out of spec, but the injectors are still dribbling at idle, which is most likely what’s causing your issue.