What Does Code P20EE Mean? OBD II fault code P20EE is a generic code that is defined as "SCR NOx Catalyst Efficiency Below Threshold Bank 1", and is set when the PCM (Powertrain Control Module) detects that the catalytic converter on Bank 1 is operating below an acceptable or allowable minimum efficiency threshold.

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Re: P0422 Main Catalyst Efficiency Below Threshold (Bank 1) Post by claymore850 » 20 Apr 2013, 21:22 You have to change your catalitic converter and the front oxygen sensor, that s a common problem on the 850 and C70 engines with a few miles on it... The use of urea-based selective catalytic reduction (SCR) is a promising method for achieving U.S. Tier 2 diesel emission standards for NOx. Sep 01, 2018 · In SCR, NO x is converted into nitrogen and water by the reaction with ammonia over a special catalyst. Typically, the exhaust gas temperature at SCR inlet (referred to as SCR temperature hereinafter) needs to be at least 200 °C for a significant level of NO x conversion to occur (Slimarik et al., 2014; Cavataio et al., 2007). Fact About SCR; International - Meeting 2010 Emissions; Mack to Use SCR (Selective Catalytic Reduction) Volvo EPA 2010; Organizations & Associations. Association for Emission Control by Catalyst; Cascade Sierra Solutions; Clean Diesel Fuel Alliance; Manufacturers Emission Control Association -MECA; SmartWay Transport Partnership; Emission News Mack Truckshas determined that certain model year 2017-2018 MP7model engines may be equipped with an improperly functioning SCR (Selective Catalytic Reduction) system due to Low NOx Conversion Efficiency DTC (Diagnostic Trouble Code), which may cause a loss of catalyst performance that violates Federal and California standards and regulations.

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Dec 01, 2009 · “SCR isn’t voodoo,” says Dave McKenna, director of powertrain sales and marketing for Mack Trucks. “SCR technology has been around since 1957 in commercial and industrial applications. Mar 15, 2018 · Within the selective catalytic reduction catalyst, the reductant reactswith the NOx to form nitrogen, carbon dioxide, and water vapor. Upstream and downstream NOx sensors provide the engine control module with engine-out and tailpipe-out NOx levels. The ECM uses the 2 NOx sensors to control exhaust NOx levels. The NOx sensor measures the amount ... Details about 2013 Mack Pinnacle CXU613 DPF/SCR Catalyst. 2013 Mack Pinnacle CXU613 DPF/SCR Catalyst. Item Information. Condition: Used. Price: US $1,550.00.
The SCR catalyst is mounted downstream of the DPF, preventing hydrocarbon, ash or soot from entering the system, Mack said, adding there is also no need for a second diesel oxidation catalyst to be positioned upstream of the SCR system. Cummins has voluntarily recalled 500,000 engines affected by an emissions equipment issue. The recall includes 500,000 engines from model years 2010-2015.