O2 Sensor Assm. HTD Pre- Cat.

The Chevrolet Performance O2 Sensor Assembly HTD Pre-Cat (part number 12665061) is a heated, wideband oxygen sensor engineered as an OE replacement for General Motors applications. This four-wire sensor monitors exhaust oxygen levels upstream of the catalytic converter, enabling precise fuel trim adjustments and optimal combustion efficiency across varying load conditions and engine temperatures.

As a heated pre-catalytic oxygen sensor, this assembly delivers faster warm-up response compared to unheated designs, reducing cold-start enrichment cycles and improving fuel economy during low-temperature operation. The wideband signal provides linear output across a wide air-fuel ratio range, allowing engine control modules to make more granular adjustments than traditional narrowband sensors. The four-wire configuration includes dedicated heating circuit power and ground, enabling independent thermal management for consistent signal quality regardless of exhaust temperature fluctuations. Compact dimensions (3.03 x 3.03 x 8.06 inches) and lightweight construction (0.22 lbs) facilitate straightforward installation in factory sensor locations without requiring exhaust modification.

This sensor serves GM performance enthusiasts, fleet operators, and technicians performing emissions diagnostics or engine management system maintenance on Chevrolet vehicles. Replacement becomes necessary when diagnostic trouble codes P0130–P0138 appear, when sensor response falls outside manufacturer specifications, or as preventive maintenance during major engine service. OE specification ensures compatibility with factory wiring harnesses, engine control module calibration, and emissions monitoring systems without requiring auxiliary modules or recalibration.

Pre-catalytic oxygen sensors occupy a critical role in the emission control chain, functioning as the primary feedback loop for fuel injection timing and idle stability. Choosing genuine GM performance components ensures signal accuracy, durability under sustained high-temperature exhaust exposure, and full compliance with factory emissions standards. This assembly represents the precise engineering standard original equipment manufacturers apply to maintain engine efficiency and regulatory compliance.

TacticalSurplusUSA stocks this Chevrolet Performance O2 sensor for prompt delivery, providing the exact replacement specification for your GM application without guesswork or compatibility risk.