Catalytic Converter for BMW X5 (2011-2013) 3.0L

Direct-Fit Catalytic Converter for 2011-2013 BMW X5 (E70)

What it Does: This direct-fit catalytic converter bolts behind the turbocharger on the 2011-2013 BMW X5 (E70) equipped with the N55 3.0L Turbo I6 to restore factory exhaust gas conversion and clear catalyst efficiency faults.

The Stock BMW X5 Catalytic Converter Failure

Positioned immediately downstream of the turbocharger outlet, the factory converter on the E70 X5 with the N55 3.0L Turbo I6 endures extreme thermal cycling and heat soak. Over time, repeated temperature spikes and unburned fuel from aging injectors or misfires cause the OEM ceramic washcoat to degrade and fracture. Once the substrate breaks apart, exhaust restriction climbs and the DME logs catalyst efficiency codes, replacing OEM units 18407645241 and 18307599198.

Common Symptoms of a Failing OEM Catalytic Converter

• Check Engine Light / DTCs: Triggers P0420 or P0430 catalyst system efficiency below threshold codes when oxygen storage capacity drops.
• Audible Substrate Rattle: Fractured internal ceramic honeycomb produces a distinct metallic rattle near the turbo downpipe during cold starts and deceleration.
• Drivability & Emissions Failure: Dislodged substrate fragments choke exhaust flow, increasing turbo backpressure, reducing boost response, and failing OBD-II emissions readiness.

The Direct-Fit Stainless Catalytic Converter Solution

Built from corrosion-resistant stainless steel tubing and a durable outer shell, this converter resists thermal fatigue cracking behind the turbocharger. Inside, a high-flow ceramic honeycomb substrate treated with a precious-metal washcoat converts HC, CO, and NOx emissions to meet EPA federal standards. Factory-matched inlet flanges, rear joints, mounting brackets, and dual oxygen sensor bungs ensure a direct bolt-on replacement for 18407645241, 18307599198, D17409FC, and 16995 without cutting or welding.

What's Included

• 1 x Direct-Fit Catalytic Converter
• 1 x Ring Gasket

Technical Specifications

Compatibility

• 2011-2013 BMW X5 xDrive35i (3.0L Turbocharged I6)
• 2011-2013 BMW X5 xDrive35i Premium (3.0L Turbocharged I6)
• 2011-2013 BMW X5 xDrive35i Sport & M Sport (3.0L Turbocharged I6)
• Exclusions: Does not fit X5 xDrive50i V8, diesel, X5 M, or 2014+ X5 models

Frequently Asked Questions & Fitment Warnings

Does this fit the E70 X5?

Yes. This is a direct fit for the 2011-2013 BMW X5 equipped with the N55 3.0L Turbocharged I6 engine. Not compatible with X5 xDrive50i V8, diesel, X5 M, or 2014+ models, and not CARB approved 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 stems from a degraded converter. Replacing a worn catalyst restores oxygen storage efficiency to clear P0420/P0430 codes, though upstream/downstream O2 sensors are not included and must be transferred or replaced separately alongside checking for exhaust leaks.

Are gaskets and mounting hardware included for installation?

A ring gasket is included. Soak all turbo outlet clamp and bracket fasteners with penetrating oil once cool, reuse or replace sensors in the two factory bungs, torque joints evenly, and verify leak-free sealing at idle.

The BMW Precision Standard

Restoring proper exhaust flow and catalyst efficiency keeps your E70 DME fueling trims accurate and prevents recurring check engine lights. Built to factory tolerances, this converter delivers dependable OBD-II compliance and quiet, restriction-free operation.