Dec 3, 2015

Assessment study for Audi Q5

While looking for replacement for my old ride , I come across the seller putting a good bargain on an Audi Q5 2009 yr UK spec.

after google around low yat forum , ClubAudiMalaysia (forum , facebook group).

I decide to put all my survey and finding into my blog so that next time when I spot another Q5 I know what to check for it.

below are 3 key issue surround this Audi Q5.

Q5 endless oil leak issue with fix of 15-17k

1. Engine oil consumption issue can be rectified with an overhaul which is gonna cost around RM15k-17k

2. Based on the mileage, wear and tears parts especially the Printed Circuit Board which is connected to your DSG gearbox cost < RM2

3. Transmission jerk on gear 1 /2 - mechatronic change and resolve the problem.


Regular maintenance

1. Regular maintenance of RM450-600 for normal 10,000

2. Major maintenance depend still.


Service Center other than Euromobile

Eurowerks at Subang/Sunway Mohd Muzzhafar

Terminal R at USJ Jackson Tan

Imola Motorsports at Ampang Akib Nadeem

Driversion at Cheras Wayne Wee


Euromobile@Chan Sow Lin branch @Darryl

German Motor@PJ @Damansara Sunway technology park

+6010 221 0041
+6016 3737 303


Look like I got a lot of choice workshop ..Smile


Below are extraction taken frm CAM(forum) by Cire – some other key issue and comment from Cire.


1. The fly by wire driving condition learning process.

When one used to driving leisurely and light footed, the car will tend to keep that driving pattern to ensure smooth drive all the time. Gear shifts will be faster to conserve fuel. On the other hand, when one drives aggressively and in a sportier mood, the pattern will be kept the next time the car is re-started. Gear changes will longer than usual to harness in the power from the engine.

Owners have tried using Dynamic and S-mode to try to resolve the problem of hesitation and jerkiness, but it is not proven to have resolve the issue this way.

I think the rapid acceleration camouflaged the jerkiness.

2. Transmission Control Unit (TCU), requiring a re-flash.

Much like upgrading of software. New found issues will be reported back to Audi AG team and solutions will be made and send to dealers around the world in accordance to their respective issues.

Q5 exported internationally are programed to the specific countries respectively, and thus the problems also defers respectively. Current program may be applicable to older issues, and may not be on yours, so it is best that your problem/s is always registered with EM/Audi, officially. * pls ask to see registering of such complain, or have a print copy demanded.

3. Transmission's oil and filter.

Some comments have claimed that a the transmission oil somehow is contaminated with air bubbles / aerates. It could be a housing design problem where crevices in the gearbox allows for air bubbles to build up. A change of the oil only resolves the problem temporarily.

The ill fitment of the gearbox oil filter also causes aerates. A change of this filter also resolved the problem temporarily.

Next time, suggest this to your Service Advisor.

4. The hill-assist inherited problem.

Now, Q5 has this feature which is a wonderful feature to have. However, the system could be easily "tricked" when a certain driving style is performed, for example coming to almost rolling stop with a hard enough brake application, and then take off again. This condition may signal to the TCU that its on a hill stop and therefore the electronic braking system continues to activate even when the foot is off the brake pedal.

As we stepped on the gas pedal to coast off, there will be a conflicting signal sent to the TCU which will need to process the condition a bit longer to determine whether the driver is trying to crept forward or accelerate away.

So, when the pedal pressure is constant, the braking system will release and the car accelerated as required after a slight hesitation.

But when harder pressure on the gas pedal is applied immediately after the release of the brake pedal, the system will know that it is on coasting-acceleration mode, and will release the braking system simultaneously as the gas pedal application. A smooth drive will be anticipated here.

This explanation however may or may not have caused the problem of jerkiness but more likely for full stop to acceleration issue/annoyance.

A safety feature to avoid a sudden forward jerk or unintended acceleration.

5. Cam follower.

I don't think this has caused the jerkiness because your Q5 is still relatively new, and its on/off issue. There is also no acceleration issue like heavy jerkings when the pedal is stepped to the floor.

So, we shall take this out of the equation.

There has been many "issues" with Audi's TFSI engine oil consumption.

According to some Audi and VW manuals, having to top up oil 0.9litre per 3,000km ( 1quart/1000miles) is considered normal. Anything beyond this, is considered as consumption of oil, and need to be monitor to check if the situation gets worse or maintaining at the same level.

Now, through extensive readings about this particular issue, I can safely conclude that the engine needs to be repaired.

The below are the common parts changed for most of the complained engines..

...Fix was performed.

-Replaced Crankcase pressure control valve / Separator.

-Replaced Front Crankshaft Seal

-Replace Piston rings

-Replace Piston

In my opinion, the main culprits by far are the top two items that needed to be changed- Pressure Control valve and Crankshaft seal.

Now, the pressure control valve regulates the engine's internal gas pressure. As the engine works, there will be gas from the combustion chambers and from its atmospheric containment. Too much pressure built up, engine received more stress, and less efficient. Optimum condition will ensure engine's potential is used effectively.

The failure or defective PCV will let more engine oil into the recycle chambers to be burnt, thus oil consumption. Recycling chambers is designed to burnt off excess oil before it is released into the atmosphere as exhaust. Dark shoot film can be seen on the tips of the exhaust pipes. That's why unlike older cars, you don't see white blume of smoke usually associated with engine oil consumption.

Some owners swore that due to moderately driving style (not hard driven), the pressure valves fails to work properly. Hard driven, the valves works and therefore keeps oil from flowing more into the recycling chambers.

There were calls also by technicians to owners to once awhile "to stretch the legs a bit .." on the car. High rev beyond 5-6k before changing gears. Sorta loosening up some dormant mechanism in the car/engine.

Crankshaft seal is replaced becos once the bottom part of the engine is open, a replacement piece is needed.

Check the cost out at Audi Euromobil.

But bear in mind that, the above two items may or may not resolve your total problem. Piston and piston rings too may cause oil to seep into the combustion chambers and got burnt. I believe the former procedure is less costly.