DPF saved. Engine saved. Customer spared an unnecessary repair.
Let me show you another example of how a workshop can get the diagnosis wrong – and remove your DPF when there's no need to.
This VW is another car we've saved after its owner came to us for a second opinion on whether the DPF really needed to be cut out.
VW 2.0 TDI DPF Problems: Sensors That Look Identical
2.0 TDI engines often have two temperature sensors. They look identical – but they're not. One measures a lower temperature range, while the other measures a higher one.
When these sensors are removed during work on other components around the engine, they can easily be fitted the wrong way round if the workshop isn't careful.
So what happens next? The engine control unit receives incorrect readings ➝ DPF regeneration fails ➝ fault codes appear ➝ "Blocked DPF" ➝ the easiest solution is to cut the filter out.
Yet the real problem is simply… two sensors fitted in the wrong positions.