Automost Oxygen Sensor 4-Pack for 2014-2020 GM Trucks & SUVs — Upstream & Downstream, Direct-Fit OEM-Style

Automost 4-pack oxygen sensors replace worn upstream and downstream units to restore accurate air-fuel monitoring for select 2014–2020 GM V6 and V8 trucks and SUVs.

When your vehicle shows symptoms like a persistent check engine light, decreased fuel economy, or rough idling, the oxygen (O2) sensors are often the first components to inspect. This Automost set includes four sensors—covering both upstream (pre-catalytic converter) and downstream (post-catalytic converter) positions—designed as direct-fit replacements for a range of Chevrolet, GMC and Cadillac models built between 2014 and 2020. Each sensor follows OEM-style construction for dependable readings and straightforward installation.

Which vehicles and engine sizes will these sensors fit?

These sensors are matched to specific GM part references and fit many popular full-size trucks and SUVs. Compatibility spans several model years and engine displacements; always verify vehicle fitment by checking part numbers against your VIN or current sensor.

• Chevrolet Silverado 1500: 2014–2018 (4.3L, 5.3L, 6.2L) and selected 2019 models (5.3L).
• Chevrolet Suburban and Tahoe: 2015–2020 (5.3L).
• GMC Sierra 1500: 2014–2018 (4.3L, 5.3L, 6.2L) and 2019 Limited (5.3L); Yukon/Yukon XL: 2015–2020 (5.3L, 6.2L).
• Cadillac Escalade: 2015–2020 (6.2L).

How do upstream and downstream sensors differ and why both are included?

Upstream sensors measure exhaust oxygen before the catalytic converter to help the engine control module tune fuel delivery. Downstream sensors monitor converter efficiency after the catalyst. Replacing both ensures consistent data for emissions control and prevents mismatched sensor performance.

• Upstream sensors provide real-time feedback for air-fuel mixture adjustments.
• Downstream sensors verify catalytic converter operation and emissions levels.
• Supplied as a matched set to reduce diagnosis time and ensure balanced readings.

What are the build quality and installation expectations?

These Automost sensors are manufactured with durable materials and designed to meet OEM-style specifications for fit and function. They include factory-style connectors and threads so they fit into original mounting locations without modification, making them suitable for DIY replacement or professional installation.

• OEM-style housing and sensor element for reliable signal output.
• Standard connector terminations for plug-and-play replacement.
• Corrosion-resistant finish and heat-shielded designs for longevity.

How will replacing these sensors affect performance and diagnostics?

Installing fresh oxygen sensors restores accurate exhaust gas readings used by the engine control system. That can eliminate false error codes, improve throttle response, and help return fuel economy to expected levels—provided there are no other underlying mechanical problems.

• Helps clear check engine codes tied to sensor failure or out-of-range readings.
• Supports correct air-fuel ratio adjustments for smoother running.
• May improve MPG if sensor degradation was causing rich or lean conditions.

Who is this for: This Automost 4-piece oxygen sensor kit is intended for owners and mechanics of compatible 2014–2020 Chevrolet, GMC, and Cadillac full-size trucks and SUVs who need an OEM-style, cost-effective replacement for failing upstream and downstream O2 sensors. Choose this set if you want matched sensors that simplify repairs, restore accurate exhaust monitoring, and help resolve emissions-related engine codes. Always confirm part numbers and vehicle compatibility before ordering.