Catalytic Converter for Buick Regal (2014-2017) 2.0L

Direct-Fit Stainless Catalytic Converter for 2014-2017 Buick Regal (Epsilon II)

What it Does: This direct-fit close-coupled catalytic converter bolts behind the turbocharger on 2014-2017 Epsilon II Buick Regal models with the LTG 2.0L Turbo I4 to restore emissions compliance and exhaust flow.

The Stock Buick Regal Catalyst Failure

Mounted directly at the turbocharger outlet on the Epsilon II chassis, the factory close-coupled converter on the LTG 2.0L Turbo I4 endures extreme exhaust gas temperatures and rapid thermal cycling. Over time, sustained heat soak degrades the precious-metal washcoat and fractures the brittle internal ceramic monolith. Once the substrate cracks or collapses, exhaust backpressure climbs, turbo spool suffers, and downstream sensors detect lost oxygen storage capacity, triggering persistent P0420 or P0430 catalyst efficiency fault codes.

Common Symptoms of a Failing OEM Catalytic Converter

• Check Engine Light / DTCs: Illuminated MIL with P0420 or P0430 triggered by depleted catalyst washcoat efficiency.
• Metallic Substrate Rattle: Audible rattling from the downpipe assembly caused by a fractured ceramic core bouncing inside the housing.
• Drivability & Emissions Failure: Sluggish boost response from elevated exhaust backpressure and failed OBD-II emissions readiness testing.

The Direct-Fit Stainless Catalytic Converter Solution

Built as a true OE-style replacement, this converter restores clean emissions conversion and smooth exhaust scavenging using a heavy-duty stainless steel body and piping engineered to resist rust and thermal fatigue. Inside, a ceramic honeycomb substrate treated with a precious-metal washcoat efficiently oxidizes HC and CO while reducing NOx. Precision factory-spec turbo flanges, support brackets, and pre- and post-catalyst 2 oxygen sensor ports ensure a leak-free bolt-on installation with no cutting or welding.

What's Included

• 1 x Direct-Fit Catalytic Converter (8 in body length, 5 in body height)
• 1 x Ring Seal
• 1 x Turbo Flange Gasket
• 4 x Bolts with Nuts and Washers

Technical Specifications

Compatibility

• 2014, 2015, 2016, 2017 Buick Regal Base (2.0L Turbo I4)
• 2014, 2015, 2016, 2017 Buick Regal Premium (2.0L Turbo I4)
• 2014, 2015, 2016, 2017 Buick Regal Sport Touring (2.0L Turbo I4)
• 2014, 2015, 2016, 2017 Buick Regal GS (2.0L Turbo I4)

Frequently Asked Questions & Fitment Warnings

Does this fit the Epsilon II Regal?

Yes. This is a direct fit for the 2014-2017 Buick Regal equipped with the LTG 2.0L Turbo I4 engine. It does not fit 2.4L or eAssist models, and as an EPA federal (non-CARB) converter, it is not legal for vehicles registered in California, New York, Colorado, or Maine.

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

Yes, when caused by a worn catalyst; O2 sensors are not included. Replacing a degraded converter restores proper oxygen storage to resolve P0420/P0430 codes, provided you inspect for exhaust leaks and transfer or replace your existing sensors.

Are gaskets and mounting hardware included for installation?

Yes. A turbo flange gasket, ring seal, and four bolts with nuts and washers are included; soak old turbo studs with penetrating oil and torque all fasteners evenly once cooled.

The Buick Precision Standard

Designed for strict OBD-II ECU calibration and forced-induction thermal demands, this converter maintains proper backpressure and clean emissions on your Epsilon II chassis. Restore quiet, CEL-free operation with an exact factory-geometry bolt-on assembly.