The Diagnostic Trouble Code (DTC) will be set when the ECM determines that the efficiency of the catalyst has degraded below a calibrated threshold. Edmunds expert review of the Used 2008 Cadillac SRX provides the latest look at trim-level features and specs, performance, safety, and comfort. Edmunds expert review of the Used 2008 Cadillac SRX provides the latest look at trim-level features and specs, performance, safety, and comfort. When the post-HO2S response is near that of the pre-HO2S, the oxygen storage capability and efficiency of the catalyst may be degraded below an acceptable threshold. Models: 2006-2011 Cadillac STS Models 2007 - 2009 Cadillac SRX 2008 - 2015 CTS (VIN D) 2013 - 2015 Cadillac ATS 2016 Cadillac ATS (RPO LCV) 2014 - 2015. When the catalyst is functioning properly, the post-catalyst HO2S response to the fuel conditions during the DFCO event is slow compared to the response of the pre-catalyst HO2S. The ECM monitors the efficiency of the catalyst by monitoring the HO2S during an off-idle, Decel Fuel Cut-Off (DFCO) event. This indicates the ability of the catalyst to convert the exhaust emissions efficiently. The HO2S produces an output signal that the ECM uses to calculate the oxygen storage capacity of the catalyst. 1 Pair, white, 6500K, High Beam: 8000lm Low Beam: 5000lm (per kit), 8-36V DC, High Beam: 50W Low Beam: 30W. The Engine Control Module ( ECM) monitors this process by using Heated Oxygen Sensors (HO2S) that are in the exhaust stream before and after the 3- way catalyst. Cadillac SRX 2008, CSP LED Headlight Conversion Kit by DS18®. This process converts the hydrocarbons and the CO into water vapor and carbon dioxide (CO2), and reduces the NOx, converting the NOx into nitrogen. The catalyst within the converter promotes a chemical reaction, which oxidizes the hydrocarbons and the CO that are present in the exhaust gas. A 3-way catalyst controls emissions of hydrocarbons, Carbon Monoxide (CO), and Nitrogen Oxide (NOx).
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