Question about Audi A4
I guess your car goes in "limp mode". If you scan the EDC-15P engine computer with a VAG or KTS -BOSCH diagnosis tool you will find this:
"Fault code: P1557 - Turbo Boost pressure control exceeded"
You must try follows if you are able to do this:
1. Engine stooped and ignition switch off. Check all pneumatic connections and hoses between turbocharger actuator = pressure unit for boost-pressure control, boost-pressure control solenoid valve, vacuum reservoir, EGR control solenoid valve, intake-manifold flap solenoid valve, EGR valve with throttle - part of intake manifold. Also the vacuum connection between tandem pump and brake booster. If you find something wrong replace parts. If not go to the step 2.
2. Extract the hose of the turbocharger actuator = pressure unit for boost-pressure control part of turbocharger. Instead of the original hose you must place another 1 meter long hose with the same inside diameter, and then you check to inspire yourself the air from the other one extremity of this hose. The mechanical connecting rod of the turbocharger actuator must have a smooth and whole motion. If you can do that with your mouth, then you must replace the boost-pressure control solenoid valve. If you can not reach this with your mouth, then you go to the step 3.
3. This is the most difficult work. The problem is that the soot particles deposits inside the turbocharger plugging the variable nozzle geometry mechanism of the turbine.
4. You must be able to extract the turbo from the engine and then to disassemble the turbocharger, clean inside and refit all.
Posted on Nov 19, 2008
A 6ya expert can help you resolve that issue over the phone in a minute or two.
Best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
The service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.
Posted on Jan 02, 2017
Tips for a great answer:
Oct 19, 2015 | Audi Cars & Trucks
Jun 17, 2011 | Audi A4 Cars & Trucks
Sep 29, 2010 | 2006 Audi A4
Sep 19, 2010 | 2005 Audi A4
Jul 29, 2009 | 2000 Ford Mustang
Jun 07, 2009 | 2003 Ford Taurus
Feb 28, 2009 | 2006 Renault 181
Jul 20, 2008 | 2000 Lotus Elan
Apr 19, 2018 | Audi Cars & Trucks
407 people viewed this question
Usually answered in minutes!
Step 2: Please assign your manual to a product: