Catalytic Converter for Cadillac SRX (2008-2009) 3.6L

Direct-Fit Stainless Catalytic Converter Pair for 2008-2009 Cadillac SRX (GMT265)

What it Does: This complete left- and right-bank direct-fit catalytic converter pair restores emissions conversion and factory exhaust flow on the 2008-2009 Cadillac SRX GMT265 powered by the LY7 3.6L V6.

The Stock Cadillac SRX Catalytic Converter Failure

On the GMT265 chassis equipped with the LY7 3.6L V6, factory converters endure severe thermal cycling near the cylinder heads. Unburned fuel from aging ignition components or oil consumption degrades the precious-metal washcoat and fractures the internal ceramic honeycomb. Once the substrate crumbles, exhaust backpressure spikes and downstream O2 sensors detect lost oxygen-storage capacity, triggering P0420 or P0430 catalyst-efficiency codes while starving scavenging flow.

Common Symptoms of a Failing OEM Catalytic Converter

• Check Engine Light / DTCs: Stored P0420 (Bank 1) or P0430 (Bank 2) codes caused by depleted washcoat oxygen-storage capacity.
• Audible Substrate Rattle: Metallic rattling beneath the floorboards at idle or deceleration from a fractured ceramic core.
• Backpressure & Emissions Failure: Sluggish throttle response, restricted exhaust flow, and failed OBD-II readiness inspections.

The Direct-Fit Stainless Catalytic Converter Solution

Engineered to replace part numbers 16684 and 16685, this stainless steel pair (8-inch body length, 5-inch height) uses factory flanges for a direct bolt-on install without cutting or welding. Each converter houses a ceramic honeycomb substrate with a precious-metal washcoat calibrated to convert HC, CO, and NOx efficiently. Integrated post-catalyst O2 sensor bungs and precision-formed piping preserve factory geometry for leak-free sealing and full OBD-II compliance.

What's Included

• 2 x Catalytic Converters (Left and Right)
• 4 x Ring Seals
• 8 x Bolts with nuts and washers

Technical Specifications

Compatibility

• 2008 Cadillac SRX 3.6L V6 (Left and Right Banks)
• 2009 Cadillac SRX 3.6L V6 (Left and Right Banks)
• Excludes 4.6L V8 models and 2010 SRX

Frequently Asked Questions & Fitment Warnings

Does this fit the GMT265 SRX?

Yes. This is a direct fit for the 2008-2009 Cadillac SRX equipped with the LY7 3.6L V6 engine. Not compatible with the 4.6L V8, 2010 SRX, or vehicles registered in California, New York, Colorado, or Maine (EPA Federal, not CARB approved).

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

Yes, when caused by a worn converter; O2 sensors are not included. Replacing both banks resolves P0420 and P0430 catalyst-efficiency codes once upstream exhaust leaks and sensor faults are ruled out; transfer existing O2 sensors or install new units.

Are gaskets and mounting hardware included for installation?

Yes. Four ring seals and eight bolts with nuts and washers are included; let the exhaust cool, soak seized studs with penetrating oil, and torque every flange evenly.

The Cadillac Precision Standard

Built to restore factory OBD-II emissions accuracy and rattle-free exhaust operation on your GMT265 SRX. Stainless steel construction and matched dual-bank flow keep your LY7 3.6L V6 running cleanly without check engine lights.