09/01/2026
WHERE DID THE FILTER GO?
These are actual micro filters removed from a GDI injector — a new replacement on the left and the used filter on the right.
Notice what's missing.
Most GDI injectors have a small internal micro filter that serves as the injectors final line of filtration. Over time, we regularly see these filters deteriorate and come apart.
And when the filter material is no longer in the filter, there's an obvious question:
Where did it go?
We've found pieces of deteriorated filter material farther inside injectors during service. Once that filter begins coming apart, the injector not only loses its final filtration barrier — pieces of the filter itself can travel through the injector.
That's not something you want moving through the extremely small internal components of a precision GDI injector.
Can we prove that deteriorating filter material causes a particular injector to fail?
No.
But material passing through the injector may contribute to internal wear or damage, which could ultimately affect injector performance.
The filter shown here came from an Audi Continental GDI injector, and this type of deterioration is particularly common in the Audi injectors we service. But it isn't unique to Continental. We see deteriorated micro filters across GDI injector manufacturers.
That's also why, when a serviceable GDI injector has a replaceable micro filter, we replace it as part of our service.
It's a tiny component that's very easy to overlook.
Until you see what one looks like when it comes apart.
