O2 Oxygen Sensor Upstream Downstream for Chevrolet Silverado 1500 (2014-2017) 4.3L, 5.3L, 6.2L

Direct-Fit 4-Piece Upstream and Downstream O2 Sensor Kit for 2014-2017 Chevrolet Silverado (K2XX)

What it Does: The 4-piece oxygen sensor kit monitors pre- and post-catalytic exhaust gas oxygen concentrations on the 2014-2017 Silverado to maintain closed-loop fuel trim precision and prevent catalytic converter fault codes.

The Stock Chevrolet Silverado Oxygen Sensor Degradation

Factory oxygen sensors on the K2XX platform suffer from severe thermal cycling, silica poisoning, and soot accumulation over extended mileage. As the zirconia solid electrolyte degrades, sensor response latency increases, causing slow rich-to-lean switching. This sluggish closed-loop signal feedback causes the engine control module (ECM) to miscalculate stoichiometric air-fuel targets on direct-injected EcoTec3 engines, leading to unburned hydrocarbons, reduced fuel economy, spark plug fouling, and diagnostic trouble codes such as P0131, P0137, P0420, or P0430.

The Engineering Solution

This 4-piece complete replacement kit features planar zirconia ceramic elements protected by dual-layer 304 stainless steel shielding to resist thermal shock and exhaust particulate contamination. Engineered with high-temp PTFE-insulated lead wiring and internal ceramic heaters, these sensors achieve rapid light-off operational temperatures within seconds of cold starts. Factory-pinned, water-sealed automotive connectors and pre-coated anti-seize threads ensure proper closed-loop lambda control and direct drop-in integration to replace OEM units 12657188 and 12659516 without wire splicing.

What's Included

• 2 x 234-4940 Oxygen Sensors
• 2 x 234-4974 Oxygen Sensors

Technical Specifications

Compatibility

• 2014-2017 Chevrolet Silverado 1500 4.3L V6 (LV3)
• 2014-2017 Chevrolet Silverado 1500 5.3L V8 (L83)
• 2014-2017 Chevrolet Silverado 1500 6.2L V8 (L86)

Frequently Asked Questions & Fitment Warnings

Does this fit the K2XX Silverado?

Yes, this is a direct fit for the 2014-2017 Chevrolet Silverado equipped with the LV3, L83, or L86 EcoTec3 engines.

Do these sensors require wire splicing or aftermarket tuning?

No, these sensors feature factory-style direct-fit connectors and pre-calibrated resistance ranges, requiring no PCM recalibration or harness modification.

The Chevrolet Truck Caliber

Engineered to handle sustained high-load towing and harsh exhaust gas temperatures, this sensor kit restores precise air-fuel ratio feedback to maintain maximum payload efficiency and heavy-duty drivetrain durability.