Catalytic Converter for Audi Q7 (2007-2010) 4.2L Left & Right

Direct-Fit Catalytic Converter Set for 2007-2010 Audi Q7 (4L)

What it Does: The catalytic converter set replaces deteriorated factory emissions units on the 2007-2010 Audi Q7 to clear catalyst efficiency codes and restore proper exhaust scavenging velocity.

The Stock Audi Q7 Catalytic Converter Degradation

Thermal stress and sustained exhaust gas temperatures from the high-compression BAR 4.2L FSI engine inevitably cause washcoat degradation on factory catalytic substrates. Over time, internal precious metal loading loses its oxygen storage capacity, prompting the ECU to register downstream catalyst efficiency threshold faults (P0420 and P0430). Continued operation with compromised converters often results in substrate sintering, physical matrix fracture, increased backpressure, and unburned hydrocarbon odor.

The Engineering Solution

Engineered as a direct replacement for OEM part number 4676461, this left-and-right assembly features robust stainless steel outer canisters paired with high-efficiency ceramic honeycomb cores. Precision-machined 3-bolt flanges match the factory downpipe and mid-pipe interfaces, eliminating any need for cutting or custom welding. Factory-located upstream and downstream O2 sensor ports ensure accurate air-fuel ratio telemetry to keep fuel trims stable and prevent CEL recurrence under heavy load.

What's Included

• 1 x Left Catalytic Converter
• 1 x Right Catalytic Converter

Technical Specifications

Compatibility

• 2007-2010 Audi Q7 4.2L V8 (Chassis: 4L, Engine: BAR) Left & Right

Frequently Asked Questions & Fitment Warnings

Does this fit the 4L Q7?

Yes, this is a direct fit for the 2007-2010 Audi Q7 equipped with the BAR 4.2L engine. Does not fit 3.6L VR6, 3.0T supercharged, or TDI diesel models.

Are these converters legal in my state?

This is an EPA-compliant 48-state emissions system; it is not legal for sale, installation, or use in California, Colorado, New York, or Maine.

The Audi Precision Standard

Direct-injection European V8 platforms demand strict catalytic efficiency monitoring to balance precise closed-loop fueling and tailpipe compliance. Re-establishing designed exhaust backpressure and proper O2 sensor switching rates protects engine management mapping and preserves powertrain performance.