The EGR valve and cooler are located on the lower left rear side of the engine. The side of the valve can been seen looking through the gap indicated by the box in the photo. Foy anyone wanting to attempt this as a DIY, I can confirm it a 6+ hour job, and requires a great deal of patience. Forum for Audi owners and fans – share your driving experience, reviews, common problems, and solutions. Join the discussion on the reliability and defects of Audi A4, A3, A6, TT, A5, A1, Q7, Q5, A8, Q3 and other popular models. Problems with odd sounds after changing cooling sensor g62. The vehicle consistently throw a DTC for Misfire on Cylinder 3, ONLY after ~5500 RPM. It goes into limp mode - EPC light on. Restarting it twice resets it and it drives well until hitting that RPM ceiling again. I changed the spark plug to a brand new Audi NGK and swapped coil plugs; also tried a brand new coil plug. Exact same behavior. Replacing the PCV valve or Pressure Regulating Valve on my 2005 Audi A6. Removal and install can be tricky.USEFUL VIDEOSUpper Intake Removal: In combination with the automatically determined learning values of the engine control module the pre- and post-injections are being calculated individually for each valve. The behavior of an injection valve is also mileage dependent, so a valve with e.g. 10000 km has a different behavior then one with 70000 km. Solenoid Valve Block The design of the solenoid block and its electric and pneumatic functions is identical to the 2011 Audi A8. The connection assignment and color coding of the lines are identical, too. However, the solenoid valve block differs from the 2011 A8, in that it is not part of the air supply unit. Instead, it is located separately in AUDI-A4-Flambé_bracket-8E0971845D.jpg. 625 KB · Views: 87 AUDI-A4-Flambé_Camshaft-Sensorx2.jpg. 98.1 KB · Views: 90 Location Heath Hayes. Dec 26, 2021 #5 I Initially posted this in a related thread on the A4 forum (same engine type). I'm about to receive a hefty bill due to a coolant leak through the EGR valve on my 2010 A6 V6 3.0 TDI (130,000 mostly motorway miles). it manifested itself initially via a low coolant level warning whilst driving on the motorway and some black exhaust smoke evident XlZw.