O2 Oxygen Sensor Upstream Downstream for Chevrolet Colorado (2007-2012) 2.9L 3.7L

Direct-Fit Upstream & Downstream O2 Sensor Kit for 2007-2012 Chevrolet Colorado (GMT355)

What it Does: This upstream and downstream oxygen sensor kit monitors exhaust air-fuel ratios on 2007-2012 GMT355 Chevrolet Colorado 2.9L LLV and 3.7L LLR engines for closed-loop ECM control.

The Stock Chevrolet Colorado O2 Sensor Failure

Factory oxygen sensors on the GMT355 Colorado with the 2.9L LLV or 3.7L LLR engine suffer from exhaust heat soak, carbon fouling, and internal heater burnout. Thermal cycling fractures the ceramic sensing element and degrades the electrodes, slowing voltage switching and skewing fuel trim calculations. Failed sensors trigger P0135 or P0141 heater codes, P0133 slow-response faults, and false P0420 catalyst alerts.

Common Symptoms of a Failing OEM Sensor

• Check Engine Light: Triggers P0135, P0141, or P0420 codes from heater burnout or slow switching.
• Erratic Idle: Rough idle and hesitation as the ECM enters rich open-loop fueling.
• Poor Economy: Higher hydrocarbons and reduced MPG from inaccurate 234-4294 feedback.

The Direct-Fit Heated Zirconia Sensor Solution

Replacing both sensors as a matched set restores rapid closed-loop feedback across the 2.9L LLV and 3.7L LLR exhaust system. Each unit features a corrosion-resistant stainless steel housing, thermal-shock-resistant zirconia ceramic sensing element, and fast-response internal heater for quick cold-start light-off. Pre-terminated OEM-style connectors and precision threads install directly into factory manifold and exhaust bungs without wire cutting or splicing.

What's Included

• 1 Upstream Oxygen Sensor
• 1 Downstream Oxygen Sensor

Technical Specifications

Compatibility

• 2007-2012 Chevrolet Colorado 2.9L
• 2007-2012 Chevrolet Colorado 3.7L

Frequently Asked Questions & Fitment Warnings

Does this fit the GMT355 Colorado?

Yes. Fits 2007-2012 Chevrolet Colorado 2.9L LLV and 3.7L LLR models. Excludes 2.8L/3.5L and 5.3L V8 trims; confirm engine before ordering.

Will this clear P0135 and P0141 codes?

Yes. Replacing failed 234-4294 sensors restores heater resistance and switching speed once cleared, assuming intact wiring.

Is harness splicing required for installation?

No. Factory-style connectors plug straight in; torque sensors carefully into a cool exhaust.

The Chevrolet Heavy-Duty Standard

Built for underbody thermal durability and towing heat loads, these sensors keep your GMT355 Colorado running clean. Restore factory fuel trim accuracy and emissions compliance.