Catalytic Converter for Audi Q3 (2015-2018) 2.0L

Direct-Fit Stainless Catalytic Converter for 2015-2018 Audi Q3 (8U)

What it Does: This direct-fit catalytic converter assembly restores factory exhaust flow and emissions conversion on the 8U Audi Q3 equipped with the CCTA 2.0L TFSI engine.

The Stock Audi Q3 Catalytic Converter Failure

On the 8U chassis equipped with the CCTA 2.0L TFSI engine, the turbo-mounted primary converter and underbody catalyst endure severe thermal cycling and exhaust pulsation. Over time, sustained heat soak degrades the precious-metal washcoat and fractures the internal ceramic core, while the factory flex joint fatigues from engine movement. Once the substrate crumbles, exhaust backpressure spikes and downstream oxygen sensors detect lost oxygen-storage capacity, triggering P0420 or P0430 fault codes.

Common Symptoms of a Failing OEM Catalytic Converter

• Check Engine Light & Efficiency DTCs: Active P0420 or P0430 codes indicating catalyst conversion efficiency has dropped below the ECU threshold.
• Metallic Substrate Rattle: Audible rattling beneath the turbocharger or floorpan caused by a broken ceramic core shifting inside the housing.
• Power Loss & Failed Emissions: Elevated exhaust backpressure restricting turbo spool alongside excessive HC, CO, and NOx tailpipe emissions.

The Direct-Fit Stainless Exhaust Solution

This direct-fit assembly replaces the worn factory unit with a stainless steel body and mandrel-formed piping engineered to resist rust and thermal cracking. Inside the 8-inch by 5-inch housing, a ceramic honeycomb substrate with a precious-metal washcoat converts HC, CO, and NOx gases without choking exhaust velocity. Integrated pre- and post-catalyst oxygen sensor bungs, a new flex joint, and a matching extension pipe ensure exact bolt-on alignment between the turbocharger flange and rear exhaust.

What's Included

• 1 x Catalytic Converter Assembly (turbo-side catalyst, flex joint, and underbody catalyst)
• 1 x Matching Extension Pipe
• 1 x Flange Gasket
• 1 x Exhaust Clamp

Technical Specifications

Compatibility

• 2015-2018 Audi Q3 (Premium, Premium Plus, Prestige) — 2.0L Turbocharged I4
• 2015-2018 Audi Q3 quattro (Premium, Premium Plus, Prestige) — 2.0L Turbocharged I4
• Excludes Audi RS Q3 2.5L models

Frequently Asked Questions & Fitment Warnings

Does this fit the 8U Q3?

Yes. This is a direct fit for the 2015-2018 Audi Q3 and Q3 quattro equipped with the CCTA 2.0L TFSI engine. Does not fit RS Q3 2.5L models. This is an EPA (federal) converter and is not CARB approved; not legal for vehicles registered in California, New York, Colorado, or Maine.

Will this clear P0420/P0430 codes, and are O2 sensors included?

Yes, if the fault is caused by a worn converter. Installing a new direct-fit unit restores catalyst efficiency to clear P0420 and P0430 codes, though you should inspect for upstream exhaust leaks first. Oxygen sensors are not included; transfer your existing O2 sensors or install new units into the threaded bungs.

Are gaskets and mounting hardware included for installation?

Yes. The package includes the converter assembly, matching extension pipe, flange gasket, and exhaust clamp. Let the exhaust cool completely, soak seized fasteners with penetrating oil, and torque all flange bolts evenly before checking every joint for leaks.

The Audi Precision Standard

Engineered for accurate ECU feedback and emissions compliance, this converter assembly restores clean sensor readings and CEL-free operation on your 8U Audi Q3. Built to factory flange geometry, it eliminates substrate rattle and maintains steady exhaust flow without custom fabrication.