35d worsening gas mileage - solved- thermostat/fan/EGR cooler - DIY with pics. 8 Attachment (s) I have a 2010 e70 35d with about 79,000 miles. Over the past 6 months or so I've noticed a drop in highway mpg from 31-32 to approx 25-26. After checking out a number of forum discussions (particularly bimmerfest and some European 335d forums), I A bad PCV valve or related component can produce a number of symptoms. For example, if the valve clogs, or gets stuck in the closed position, you'll notice one of these symptoms. Increase in internal engine pressure. Failure of one or more oil seals or gaskets. Engine oil leaks. Low Pressure EGR Problem. So the dealer came up with 2 recommendations. Wanted to get your thoughts based on the diagnostics report. I appreciate any direction you guys can give me. Either replacing the EGR myself or the Solenoid. Thanks, Claudio. Attached Images. CLAUDIO.X5-DIAG.pdf (1.80 MB, 653 views) BMW of North America, LLC (BMW) is recalling certain 2014-2018 328d, 328d xDrive, X5 xDrive35d, 2014-2016 535d, 535d xDrive, 2015 740Ld xDrive, and 2015-2017 X3 xDrive28d vehicles. The high-pressure fuel pump may fail. Remedy. Dealers will replace the high-pressure fuel pump, free of charge. Owner notification letters are expected to be mailed To remove the pipe, use an adjustable or crescent wrench or disconnect the pipe at the exhaust manifold. After removing the EGR valve, check the valve's gasket (s). If it still looks in good shape, recycle it. Otherwise, buy a new one. Some auto parts stores only sell the gasket as part of a new EGR valve. Suddenly you've created an environment where overheating and high pressure could create some serious problems. Instead of replacing an EGR valve and EGR cooler, you're looking at much more expensive repairs. This could include rebuilding an engine or replacing a cylinder head. Calibrating Your EGR System After Deleting Is Important! Many of 2015 X5’s Complaints Covering Engine Problems Point to the Fuel System and EGR Valve as the Causes. One of the biggest problems with the 2015 X5, which prompted one of vehicle’s six recalls and many complaints, is its faulty high-pressure fuel pump. Air system, air to EGR exhaust mass flow, plausibility measured air mass compared: to calculated air mass too high. 257E00: EGR controller, position sensor, signal: Interruption or short circuit to ground. 255D00: EGR controller, actuation: Interruption. 255B00: EGR controller, position control: Valve too wide closed/positive control deviation Tuesday 4th February 2020. got my egr cooler replaced last week after i got a drive chain message and my 5 series went into limp mode!!!. took it in to bmw seafield edinburgh they did it the The EGR valve connects the exhaust manifold to the intake manifold. The EGR valve is normally closed. There is no EGR flow when the engine is cold, at idle, or during hard acceleration. EGR flow is at its peak during steady cruising under moderate load. The engine computer (PCM) opens or closes the EGR valve to control the flow within the EGR owjw.