Oxygen Sensor 2014-2020 GM 4.3L, 5.3L, 6.2L 12659516

GM 12659516 Heated Oxygen Sensor – Upstream O₂ Sensor

GM 12659516 is a genuine upstream heated oxygen sensor used on many late-model GM half-ton trucks and full-size SUVs. Mounted in the exhaust ahead of the catalytic converter, it monitors oxygen content so the ECM can correct fuel trims, helping maintain power, emissions compliance, and fuel economy.

• Brand: GM Genuine Parts / ACDelco GM Original Equipment

• GM Part Number: 12659516

• Replaces: 12637679

• Product Type: Heated oxygen sensor (O₂), upstream / pre-catalyst

Function

• Measures oxygen content in exhaust so the ECM can run closed-loop fuel control

• Helps optimize air/fuel ratio, emissions, and fuel economy

• Direct-fit OE sensor with correct connector and harness length

Fitment (examples – always verify by VIN):

• 2014–2020 Chevrolet Silverado 1500

• 2014–2020 GMC Sierra 1500

• 2015–2020 Chevrolet Tahoe / Suburban

• 2015–2020 GMC Yukon / Yukon XL

• 2015–2020 Cadillac Escalade / Escalade ESV

(Used in various upstream positions depending on engine/option – e.g. left front, right front, left upper, right upper.)

Sales & Packaging

• Quantity: Sold individually

• Country of Origin: Genuine GM OE – country of origin can vary by batch (check package for exact “Made in” marking)