O2 Oxygen Sensor Upstream Downstream for Cadillac Escalade (2015-2018) 6.2L

Direct-Fit O2 Oxygen Sensor Complete Kit for 2015-2018 Cadillac Escalade (K2XX)

What it Does: The complete 4-piece oxygen sensor kit replaces degraded factory upstream and downstream sensors on the 2015-2018 Escalade to restore precise air-fuel ratio monitoring, correct fuel trim imbalances, and clear catalytic converter diagnostic trouble codes.

The Stock Cadillac Escalade Sensor Contamination & Degradation

High-mileage L86 direct-injected engines produce carbon particulate, oil vapor blow-by, and severe thermal cycles that foul the factory zirconia sensing elements over time. As aging upstream wideband and downstream narrowband sensors experience silica poisoning and thermal exhaustion, heater circuit response slows significantly. This degradation forces the engine control module into rich open-loop fuel enrichment, causing degraded fuel economy, rough idle, fouled spark plugs, and common CEL fault codes like P0135, P0141, and P0420.

The Engineering Solution

This 4-piece replacement package incorporates fast-acting ceramic planar elements and integrated heating circuits to achieve closed-loop closed-circuit operating temperature within seconds of a cold start. Constructed with double-protection 304 stainless steel housings, laser-welded bodies, and pre-applied high-temperature anti-seize threads, these sensors block environmental contamination and soot intrusion. Swapping both upstream pre-cat and downstream post-cat positions concurrently eliminates signal cross-drift and maintains accurate stoichiometric feedback across all banks.

What's Included

• 2 x 234-4940 Oxygen Sensors (Direct-fit connectors)
• 2 x 234-4974 Oxygen Sensors (Direct-fit connectors)

Technical Specifications

Compatibility

• 2015-2018 Cadillac Escalade Base 6.2L V8
• 2015-2018 Cadillac Escalade Luxury 6.2L V8
• 2015-2018 Cadillac Escalade Premium / Premium Luxury 6.2L V8
• 2015-2018 Cadillac Escalade Platinum 6.2L V8
• 2015-2018 Cadillac Escalade ESV 6.2L V8

Frequently Asked Questions & Fitment Warnings

Does this fit the K2XX Escalade?

Yes, this is a direct fit for the 2015-2018 Cadillac Escalade equipped with the 6.2L L86 engine. Verify engine displacement prior to ordering, as this kit is not configured for non-6.2L applications.

Do these sensors require wire splicing or aftermarket tuning?

No, these sensors feature factory-style harnesses and pin-compatible connectors for direct plug-and-play installation without wire modification or calibration re-flashes.

The Cadillac Heavy-Duty Standard

Engineered to handle the high-heat exhaust flow demands of full-size towing and continuous highway hauling, this sensor set ensures durable operation and consistent fueling accuracy under maximum vehicle payloads.