High smoke readings

A 2007 Volkswagen Sharan failed its technical inspection twice, with smoke readings of 4.7 and 4.5. The workshop checked the engine ECU software and found that it had already been modified, including a software change that disabled DPF operation.

ECU software review

The existing file was reviewed, the power increase was removed, and the settings were adjusted while retaining the standard power level. The car was then checked again with a smoke opacity analyser.

Repeat measurement

After the software adjustment, the analyser readings were approximately 1.2–1.5, substantially lower than the initial 4.5–4.7. The video shows a repeat test after the work, but does not confirm a separate official inspection result.