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Old January 11th, 2016, 14:36   #5
Matt-98AHU
Loose Nut Behind the Wheel Vendor
 
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Join Date: Apr 2006
Location: Vallejo, CA
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Need to be careful when the sub-code is "range/performance". That can mean something is genuinely not working correctly to reduce NOx in your case and the sensor is picking that up. Could be EGR incorrect flow due to a variety of reasons (though typically it would set a code for EGR insufficient flow directly), could be the SCR cat has a problem, could be you're getting incorrect amount of diesel exhaust fluid to properly reduce NOx because either there is a leak or excess crystalization somewhere in the system preventing the appropriate amount of DEF to be dosed into the exhaust. Or maybe the DEF pump isn't pumping adequately.

Could even be that someone put in something other than DEF or a poor quality aftermarket DEF in the car.
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Last edited by Matt-98AHU; January 11th, 2016 at 14:40.
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