Removing and installing particulate filter - vehicles with engine code CPNB — AUDI
Removing and installing particulate filter - vehicles with engine code CPNB on Audi: 15 steps, engines CDUD, CGQB, CPNB, CTBA.
On the Audi Q5 2008–2017 (8R) with engine code CPNB, the particulate filter is mounted right on the turbocharger and comes out from above after a fair amount of clearing. The rear noise insulation goes first so a nut underneath can be removed, then the plenum chamber partition panel is taken out to open the top of the engine bay. Several connectors are taken out of their brackets, the pressure differential sender G505 is unclipped and moved aside, and the NOx sender control unit J583 is unbolted and moved clear. The remaining nuts, some reached from above, are removed and the filter is lifted off the turbocharger. Two things decide the result: new seals, gaskets and self-locking nuts, and aligning the exhaust stress-free before tightening.
🧭 Before you start
Remove the rear noise insulation and the bottom nut, then the plenum chamber partition panel. Unplug and move clear the wiring, G505 and J583, remove the upper nuts and detach the filter from the turbocharger. Refit with new seals and self-locking nuts, route the wiring correctly, align the exhaust free of stress, refit the panels and run the adaption in Guided Functions if the filter was renewed.
Fits: Audi Q5 (8R, 2008–2017)
- Renewed: seals
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- Follow the exhaust system safety precautions; parts may still be hot.
- Renew seals, gaskets and self-locking nuts on the filter-to-turbo joint.
- Route the electrical connections as specified so nothing touches the hot exhaust.
- Align the exhaust system stress-free before final tightening.
- After renewing the filter, perform the adaption in Guided Functions.
Written for this job from the workshop steps below · TorqFix editorial.
📋 Procedure
- Remove rear noise insulation (2)General body repairs, exterior66Noise insulation; Exploded view - noise insulation.
- ⚠ When working on all parts of the exhaust system:Observe safety precautions when working on the exhaust system . — Remove nut (1). [Note: The nuts (2) are removed at a later stage.Disregard (item 3).]
- Remove plenum chamber partition panel General body repairs, exterior50Bulkhead; Exploded view - plenum chamber partition panel.
- Take electrical connector (3) out of bracket, unplug it and move electrical wiring clear.
- Unplug electrical connector (2), unclip pressure differential sender G505 from bracket and move clear. [Note: Disregard (item 1).]
- Detach electrical connectors (1, 5, 6) from bracket and unplug connectors. [Note: Disregard (items 2, 3, 4).]
- Unplug electrical connector (1) and move wiring clear.
- Unscrew nuts (arrows) and move control unit for NOx sender J583 clear.
- Remove nuts accessible from above (2).
- Remove nuts (arrows), detach particulate filter from turbocharger and remove filter. [Note: Renew seals, gaskets and self-locking nuts.]
- Electrical connections and routing .
- Install plenum chamber partition panel General body repairs, exterior50Bulkhead; Exploded view - plenum chamber partition panel.
- Align the exhaust system so it is free of stress .
- Install noise insulation General body repairs, exterior66Noise insulation; Exploded view - noise insulation.
- After renewing particulate filter, perform Adaption in Guided Functions.
Other AUDI procedures
- Removing and installing exhaust gas temperature sender 1 G235 - vehicles with one turbocharger
- Removing and installing exhaust gas temperature sender 3 G495 - vehicles with one turbocharger
- Removing and installing exhaust gas temperature sender 1 G235 - vehicles with engine codes CDUD, CPNB, CTBA and CTBC
- Removing and installing exhaust gas temperature sender 3 G495 - vehicles with engine codes CDUD, CPNB, CTBA and CTBC
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Who makes these pages, and how
TorqFix was built by a mechanic — after a 2,700 km drive with five roadside repairs that no diagnostic tool could explain.
The figures on this page come from manufacturer workshop documentation and are shown as they are. The page is assembled automatically from that data — it is not written by an AI. The AI works in the chat, where it answers for your specific car. It writes nothing here.
Variants of the same model differ. Cross-check torque against the factory manual for your engine before final tightening.
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The story behind TorqFix →Workshop data on this page last updated 20 Sep 2026.