Exhaust system fault prompts BMW diesel models recall

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BMW X5 diesel

BMW has issued a recall for the X5, X6 and 3 series diesel models. Image from Wikimedia Commons.

BMW has announced a recall for late models of its diesel-powered vehicles due to an issue with  exhaust emissions system components. The recall affects 2009 to 2011 model year X5, X6 and 3 series vehicles with diesel engines.

Luxury diesels fraught with issues

BMW, according to AutoGuide, is recalling late model X5 and X6 crossovers and 3 series cars with diesel engines, due to issues with fuel and emissions system parts. The cars subject to the recall are from the 2009 to 2011 model years.

Late model BMW diesel cars seem to be fraught with issues, as a number of recalls for diesel models have been issued in the past year. The diesel X5 in particular seems fraught with problems. In June, according to AutoGuide, 2012 model year diesel X5 SUVs made between March 31 and May 19, 2011, were recalled for a faulty belt tensioner.

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On Aug. 31, 2011, according to MotorTrend, 2009 diesel X5 models were recalled for a faulty fuel filter heater, which could remain on after the engine was shut off, leading to a potential fire. Two days later, according to AutoBlog, the recall was extended to diesel 1 and 5 series cars.

Emissions system components

The current BMW diesel recall, according to AutoGuide, is with three different central components of diesel engines. The issue lies with the SCR catalyst, DEF mixer and EGR valve, which are parts of the emissions systems.

The SCR catalyst is a component of the selective catalytic regeneration system, which filters exhaust emissions. Gases are treated by mixing them with Diesel Exhaust Fluid, or DEF, which is fed through the exhaust gas recirculation system, which sends cooled exhaust gases back to the engine. In diesel engines, this cools the air and other gases igniting inside the engine, according to Wikipedia. This process reduces particle emissions.

The fault in the components in the affected 2009 to 2011 X5 xDrive 50i, X6 xDrive 50i and 3 series diesel models can cause sensors to read higher mileage than the car has. This can cause the “service engine” light to come on because the sensors will read that the car is in violation of emissions standards.

Recall beginning soon

All told, there are 24,340 vehicles in the United States that are subject to this recall. BMW is going to notify owners via mail. The recall itself is scheduled to begin on or before May 9.

Owners simply have to take their vehicle to the nearest BMW dealership, where their vehicle will be inspected. Service technicians will replace any components that must be replaced free of charge, which seems the least they can do considering the extra expense of purchasing a diesel model.





AutoGuide: http://www.autoguide.com/auto-news/2011/06/2012-bmw-x5-diesel-recalled-due-to-issue-with-belt-tensioner.html

Wikipedia on EGR valves: http://en.wikipedia.org/wiki/Exhaust_gas_recirculation

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