O2 Oxygen Sensor Upstream Downstream for Cadillac SRX (2010-2016) 3.0L 3.6L

Direct-Fit Upstream & Downstream O2 Oxygen Sensor Kit for 2010-2016 Cadillac SRX (GMT166)

What it Does: This 4-piece oxygen sensor kit monitors pre- and post-catalyst exhaust gas ratios on the GMT166 Cadillac SRX (LF1/LFX) for accurate ECM fuel trim control.

The Stock Cadillac SRX Sensor Degradation Failure

High-mileage GMT166 models equipped with LF1 3.0L V6 and LFX 3.6L V6 engines expose OEM sensors to severe thermal cycling and soot buildup. Over time, zirconia elements carbon-foul and internal heater resistance spikes, causing sluggish voltage switching. When Bank 1 or Bank 2 sensors lag, the ECM locks into rich fuel trims, triggering P0135, P0155, or P0171 codes and overheating catalysts.

Common Symptoms of a Failing OEM Oxygen Sensor

• Check Engine Light: Triggers P0135, P0141, P0155, and false P0420/P0430 codes.
• Erratic Fuel Trims: Skewed voltage causes rough idle and highway surging.
• Poor Economy & Failed Smog: Forces rich open-loop fueling and emissions failures.

The Direct-Fit 4-Sensor Replacement Solution

Replacing all four sensors simultaneously restores balanced Bank 1 and Bank 2 feedback on LF1 and LFX exhaust manifolds. Built with stainless steel housings and fast-response zirconia elements, these units match 234-4815 and 234-4816 calibration specs. Direct-fit weatherpack connectors ensure plug-and-play signal integrity without wire splicing, eliminating voltage drop and restoring closed-loop fuel control.

What's Included

• 2 Upstream Oxygen Sensors
• 2 Downstream Oxygen Sensors

Technical Specifications

Compatibility

• 2010-2011 Cadillac SRX 3.0L V6 (LF1)
• 2012-2016 Cadillac SRX 3.6L V6 (LFX)

Frequently Asked Questions & Fitment Warnings

Does this fit the GMT166 SRX?

Yes. Fits 2010-2011 SRX 3.0L V6 (LF1) and 2012-2016 3.6L V6 (LFX). Excludes 2004-2009 first-gen SRX models; confirm engine before ordering.

Will replacing all four sensors clear P0135 or P0420 codes?

Yes, for sensor faults. Resolves heater and response codes (P0135, P0155, P0141); persistent P0420/P0430 codes require catalyst inspection.

Do these sensors require cutting or splicing factory wiring?

No. Direct-fit OEM connectors match 234-4815 and 234-4816 for true plug-and-play installation.

The Cadillac Precision Standard

Accurate stoichiometric feedback on the GMT166 platform ensures reliable emissions compliance and clean ECM operation. Replacing all four aged sensors prevents recurring CELs and protects catalytic converters.