O2 Oxygen Sensor Upstream Downstream for Cadillac ATS (2013-2017) 2.0L 2.5L

Direct-Fit Upstream & Downstream O2 Sensor Kit for 2013-2017 Cadillac ATS (Alpha)

What it Does: This matched oxygen sensor kit monitors exhaust oxygen before and after the catalytic converter on the Alpha Cadillac ATS (LTG 2.0L / LCV 2.5L) to regulate air-fuel ratio and catalyst efficiency.

The Stock Cadillac ATS O2 Sensor Failure

Factory oxygen sensors on the Alpha chassis equipped with the LTG 2.0L turbo or LCV 2.5L I4 endure severe exhaust heat cycling. Over time, carbon soot, oil residue, and exhaust moisture degrade the zirconia element and burn out the internal heater circuit. This slows sensor voltage switching response and triggers P0135, P0141, or P0171 ECU faults while forcing inaccurate open-loop fuel trims.

Common Symptoms of a Failing OEM O2 Sensor

• Check Engine Light & DTCs: Triggers P0135 (Sensor 1 heater), P0141 (Sensor 2 heater), or P0420 efficiency codes.
• Fuel Trim & Idle Instability: Sluggish voltage switching causes rough idle, boost hesitation, and carbon-fouled plugs.
• Failed Emissions & Economy Drop: Rich/lean fueling errors elevate tailpipe emissions and reduce MPG.

The Direct-Fit Dual-Sensor Solution

Replacing both upstream (Sensor 1) and downstream (Sensor 2) sensors as a matched set restores factory ECM closed-loop accuracy across the exhaust stream. Built to match OEM specs for 234-4763 and 234-4762, each unit features a stainless steel housing, fast-acting zirconia element, and factory-length harness with keyed weatherproof plugs. Direct-fit thread geometry installs cleanly into OEM bungs with zero cutting or wiring splicing.

What's Included

• 1 Upstream Oxygen Sensor
• 1 Downstream Oxygen Sensor

Technical Specifications

Compatibility

• 2013-2015 Cadillac ATS 2.0L Turbo I4 (2 sensors: upstream & downstream)
• 2013-2016 Cadillac ATS 2.5L I4 (2 sensors: upstream & downstream)

Frequently Asked Questions & Fitment Warnings

Does this fit the Alpha ATS?

Yes. Direct fit for 2013-2015 ATS LTG 2.0L Turbo and 2013-2016 LCV 2.5L I4. Excludes 3.6L V6, 2016-2017 2.0L, and 2017 2.5L models.

Will this clear P0135 or P0420 codes?

Yes, if sensor degradation caused the fault. Replacing 234-4763 and 234-4762 resolves heater (P0135/P0141) and response codes, unless the catalytic converter substrate itself is damaged.

Are OEM connectors included for plug-and-play install?

Yes. Factory-terminated harnesses plug straight into the OEM chassis connectors with no cutting or splicing.

The Cadillac Precision Standard

Engineered for exact ECM signal fidelity, this matched O2 sensor kit keeps your Alpha ATS emissions-compliant and CEL-free. Restore crisp closed-loop fueling and accurate catalyst monitoring without altering factory wiring.