O2 Oxygen Sensor Upstream Downstream for Chevrolet Impala Malibu (2013-2019) 2.5L

Direct-Fit Upstream & Downstream O2 Sensor Kit for 2013-2019 Chevrolet Impala,Malibu (GMX351 / GMX353)

What it Does: This matched upstream and downstream oxygen sensor kit monitors exhaust air-fuel ratios and catalyst efficiency on 2013-2019 Chevrolet Impala and Malibu LKW 2.5L I4 models on the Epsilon II (GMX351 / GMX353) chassis.

The Stock Chevrolet Impala,Malibu Sensor Failure

Factory oxygen sensors on the Epsilon II (GMX351 / GMX353) platform with the LKW 2.5L I4 engine endure relentless thermal cycling and carbon soot exposure. Over time, internal heater elements burn out, silicone or oil residue contaminates the zirconia sensing cell, and exhaust heat embrittles wiring insulation. When sensor response slows or flatlines, the ECM loses closed-loop fuel control, triggering codes like P0135, P0141, or P0420.

Common Symptoms of a Failing OEM Oxygen Sensor

• Check Engine Light / DTCs: Heater circuit or slow-response faults including P0135, P0133, and P0141.
• Erratic Fuel Trims: Sluggish millivolt feedback forces rich open-loop operation, causing rough idle and exhaust soot.
• Emissions Failure: Elevated tailpipe hydrocarbons, reduced fuel economy, and incomplete OBD-II readiness monitors.

The Direct-Fit Matched O2 Sensor Solution

Replacing both sensors together restores synchronized pre-catalyst fuel trim feedback and post-catalyst monitoring on the LKW 2.5L I4. Each direct-fit sensor uses a fast-light-off zirconia planar element, stainless steel body, and factory-indexed connectors replacing OEM numbers 12643707, RE1687-247, and 234-4762. Pre-applied thread anti-seize and OEM harness lengths provide splice-free installation and accurate millivolt output to the ECM.

What's Included

• 1 Upstream Oxygen Sensor
• 1 Downstream Oxygen Sensor

Technical Specifications

Compatibility

• Chevrolet Impala (2014-2019) — 2.5L
• Chevrolet Malibu (2013-2015) — 2.5L
• Chevrolet Malibu Limited (2016) — 2.5L

Frequently Asked Questions & Fitment Warnings

Does this fit the GMX351 / GMX353 Impala,Malibu?

Yes. This fits the 2013-2019 Chevrolet Impala,Malibu equipped with the LKW 2.5L I4 engine. Excludes 2.0L, 2.4L, and 3.6L engines; confirm engine size before ordering.

Will this clear P0135/P0141 codes and restore fuel economy?

Yes. New sensors eliminate heater circuit faults like P0135 and P0141, restoring closed-loop fuel trims once cleared with a scan tool.

Is wire splicing required for installation?

No. Both sensors include factory plug-and-play connectors for direct installation into the stock exhaust bungs.

The Chevrolet Precision Standard

Precise O2 feedback keeps the LKW 2.5L I4 running efficiently with consistent OBD-II readiness and OEM plug-and-play reliability.