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sharon Posted on Jan 31, 2015
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Cost of repairing audi being in limp mode

Motorway run

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Bill Boyd

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  • Audi Master 53,816 Answers
  • Posted on Feb 03, 2015
Bill Boyd
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Imp mode is activated by the ECM when certain sensors are out of set parameters . The sensors concerned cover both the engine and transmission and are set to protect both the engine and transmission. To get an idea of the cost you will first have to run the fault codes to find the fault and then get quotes to fix. It could be a simple wiring problem to complex repair/replacement effort.

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How do i fix my limp mode problem on my VW Tiquan 2.0TDI 2011modle

I don't have a solution but I do have a web site for you that discusses limp mode and how to troubleshoot and potentially solve your issue.

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Sounds like it's in Limp Mode.
Does the dash gear display flash, or is it highlighted different to normal?
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www.CERACOAT-NANOTECH.com
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What is a limp mode

limp mode is when the ECM reduces power in the engine to prevent damage to the engine and gear box. It allows you to get the car to a position of safety to check items like oil and coolant levels and temperature .Run fault codes to find the cause of the limp mode
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My 2004 Audi A6 tdi can only get up to 2nd gear in auto or tiptronic. Auto gearbox garage said it is the engine - VW/Audi garage said engine is ok. No fault codes or dash warnings. was on the motorway...

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P1588 Audi fault code . For engine mount sensor can anyone tell me why an engine mount needs a sensor

would this sensor going cause the car to go into limp mode? have a slight knock sometimes from under drivers side when car excelorating, now its started going into a limp mode when seemingly on bypasses and motorways but car runs fine on normal roads
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Hi i have an audi a6 1.9tdi with the awx engine in it it keeps going into limp mode there is no air leaks ive read the codes and it say says turbo over boost? new egr, you can see the actuvator arm move...

In your case the turbocharger is responsible for engine losing power.
The car goes in "limp home" mode!!!
After scan the EDC-15P engine control unit with a VAG or KTS -BOSCH diagnosis tool you will find this: Fault code: P1557-Turbo Boost pressure control exceeded
1. Engine stopped 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 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 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 = adjustable vanes of the turbine. If the turbocharger actuator is not able to adjust the turbine vanes the charge air pressure increase too much and ECU (engine control unit) go in "limp mode" = engine protection software. As a result the "limp home" mode engine still running until you turn the engine off (ignition switch off) and back on when the "limp mode" is deactivated, but the fault still remain in ECU memory!
4. You must be able to extract the turbo from the engine and then to disassemble the turbocharger, clean inside adjustable vanes mechanism and refit all.
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