Hi I'm a new member here and would like some help in regards to my current situation...
I have a 2011 Audi A6 3.OTFSI S-line. Just recently, I was driving down the highway and the Malfunction Indicator Lamp (MIL) turned on. I used a Maxiiscan OBD scanner and gave me the following code P0068: MAF/MAP Throttle Position Correlation. After doing some research, I found that the supercharged 3.0T engine did not have a MAF sensor but has 3 MAP sensors (G71, and 2x G72). I took out the sensors and cleaned them with MAF sensor cleaner from CRC for all three sensors. I also took out the air filter box, vacuumed any dirt and leaves, and cleaned the throttle body (without taking it out). I put everything back on and cleared the DTC codes but the MIL came back on after two days of driving. Afterwards, I decided to take out the entire throttle body and clean it until it shined again. I also used a cleaner for electronics to clean the electric plugs for the sensor. Unfortunately, the MIL lamp came back on again after about two days. Today, I decided to clean the snow screen/strainer. It was kind of dirty so I thought it might be restricting airflow. I drove around the highway, and the car drives great without any rough idles and shifts instantly. I don't know what's going on, and I would appreciate some insight in regards my problem.
FYI, I do not have access to VCDS - VagCom so I was not able to perform a throttle body adjustment after taking it out. I have tried everything and wanted to know if I can do anything else to help fix my problem...
I have attached some pictures.
I also read the manual for the 3.0T engine and it stated the following.
Air mass and charge pressure are two factors used
for engine load management. For this purpose, there
are three sensors with absolutely identical functions.
They measure the intake air temperature and the intake
manifold pressure. The fi rst sender unit is located
upstream of the throttle valve control module J338 and
contains the following senders:
– Intake air temperature sensor G42
– Manifold absolute pressure sensor G71
The other identical senders are integrated in the
supercharger module. They measure the pressure and
temperature of the air in each individual cylinder bank.
It is important that the measuring point be located
downstream of the intercoolers. The values measured
here correspond to the actual air mass in the cylinder
banks.
Edit: I used another scanner and I was able to read two codes: P0068 (MAF/MAP Throttle Position Correlation) and P0507 (Idle Air Control System RPM Higher Than Expected). I took everything off again including the airbox, intake hose, and throttle body. I cleaned everything and made sure the gasket on TB was sitting properly. I reinstalled everything and cleared the codes. After about 2 days, the CEL came back on with the same code (p0068) but the other code did not come back. I have read a couple threads regarding checking vacuum leaks and PCV hose. I found that when the engine idles, there was an absurd vacuum under the oil cap which suggests that the PCV might need replacing. I know its kind of PITA to get in there but I am willing to do it if that would be my only problem. Do you guys have any ideas?
Reply With Quote
Originally Posted by Demma
Bookmarks