CEL!!!!!!!!!!!!!!

[ZibAudi]

I own a '04 A4 V6 Quattro.  My CEL keeps comong on. I took it to Autozone and they read the code p0741. The guy told it was for Torque converter stuck or off.  He told me not to worry bout it too much. It could be due to the cold weather or bad battery.  I checked my battery and it was bad.  I will change it soon.  Just wanted to see if anyone else ever had this problem. 

My other problem is the ESP light keeps coming on.  Can someone help with this problem?!

Also, my rear R&L lights keeps going off.   Any help?!

I'm about to sell this car and try to get some money for it while it's still worth more than my loan!!!!!!

[info@a4mods]

are you sure that is the right code?  It is not even in my DTC list for the car.  I am assuming the car is an automatic correct>

[EuroCro]

Does the ESP light come on ONLY When driving or ??? .. And also when you unplug your battery the ESP light would be on for a few mins..

[ZibAudi]

Yes, the car is AT.  That's what the guys at autozone told me. Torque converter has something to do with the tranny right?  Is this a serious problem?


The ESP comes on usually when I press on the brakes and shift from P to D.  Sometimes it won't happen til I'm driving and have to come to a stop.  Whenever it happens, it's usaully when I press the brakes.

[info@a4mods]

Yes the torque converter is only for an automatic transmission.  It is a fluid coupling between your engine and transmission which has the capability to hydraulically lock and unlock.   When you come to a stop (zero output speed), you need to (loosely) decouple the engine from the transmission so that the transmission doesnt pull the engine to zero speed.

Think of what happens in a manual transmission when you come to a stop and leave it in gear - the output of the trans goes to zero (connected to the wheels), so the input of the trans (engine) must also go to zero - i.e. you stall the car.   The torque converter is what allows your vehicle to idle and not stall - the coupling will engage as a function of engine speed, etc.  So when you are at idle, it is continuously slipping - the torque transferred through the slipping coupling is low enough to be overcome by the brakes, but high enough to get the vehicle rolling when you release the brakes (creep torque)


If your torque converter is intermittently stuck on, you may find your car stalling every now and again because when you come to a stop, your engine would not be released from the trans.


However, as I said earlier, the code you have posted is not listed in the Bentley service manual - so I don't even know if it is correct.

[ziggituning]

I saw this issue on an older chevy Z24, the sensor that would lock the torq converter at highway speed to lower the rpms wnet bad, all I did was disconnect the sensor so it would no longer lock the TC, the car reved a little higher but no codes no issues. In your case I wonder if the brake switch or the auto trans interlock would have anything to do with it, or it could be a sensor defect (as in the Z24 issue), maybe call the dealer and ask the parts counter if your trans has a sensor for the TC, if so this could be faulty.

here is what I found related to the parts on the auto trans. I think your issue may be in the valve body see fig 3 for more details, if you can get a vag copm scan you may be able to better isolate the issue.

Fig.1    Diagnostic connector

Fitting location: The diagnostic connector is located below the knee protector to the left of the steering wheel.

 
 
 
→ Fig.2    Solenoid for selector lever lock -N110

Fitting location: The selector lever lock solenoid is located in the shift mechanism -arrow-.
 
 
 
→ Fig.3    Valve body

Fitting location: The valve body is bolted to the underside of gearbox housing inside the oil pan.

The solenoid valves -N88, -N89, -N90 and pressure control valves 1 (-N215), 2 (-N216), 3 (-N217) and 4 (-N218) are connected to the valve body.
 
 
 
→ Fig. 4    Internal wiring harness in gearbox with integrated gearbox oil temperature sender (ATF) -G93

Fitting location: The wiring harness is attached to the valve body.






 
 
 
→ Fig.5    Multi-function switch -F125

Fitting location: The multi-function switch is on the left of the gearbox; -arrow- shows connector for multi-function switch.

Note:

Multi-function switch -F125 is also known as drive stage sender -F125.
 
 
 
→ Fig.6    Switch for Tiptronic -F189

Fitting location: The Tiptronic switch is integrated in the circuit board of the symbol inlay located in the shift mechanism covering.

It comprises 3 Hall sensors (-A-, -B-, -C-), operated by a solenoid on the cross roller of the screen.

A - Sensor for downshift switch
B - Sensor for Tiptronic-recognition
C - Sensor for upshift switch
 
 
 
→ In case of faults first check that the solenoid on the cross roller -C- of the screen is correctly fixed in place; replace the screen as necessary. The symbol inlay with integral circuit board must only be replaced after the wiring has been checked. On vehicles with multi-function steering wheel the buttons on the steering wheel and their wiring connections must also be checked.
 
 
 
→ Fig.7    Relay for automatic gearbox -J60

Fitting location: On relay carrier in the electronics box in the plenum chamber.

    4 -    Relay for automatic gearbox -J60
Check relay for automatic gearbox -J60 =>Page 37-19

 
 
 
→ Fig.8    Gearbox output speed sender -G195

Fitting location: The gearbox speed sender is located at rear right of gearbox.

Note:

Gearbox output speed sender -G195 is also referred to as gearbox speed sender -G38.
 
 
 
→ Fig.9    Sender for gearbox input speed -G182

Fitting location: The sender -A- is a Hall sender and is fitted on gearbox housing behind valve body.

 
 
 
→ Fig.10    Selector lever position indicator -Y6

Fitting location: Integrated in dash panel insert

Note:

Selector lever position indicator can only be replaced jointly with dash panel insert
 
 
 
→ Fig.11    Kickdown switch -F8

Fitting location:

◆ On diesel models, arranged as a switch and integrated in housing of accelerator position sender -G79.
◆ On petrol models, a definite value is saved in engine control unit by accelerator position senders -G79/-G185.

 
 
 
→ Fig.12    Brake light switch -F

Fitting location: Brake light switch -arrow- is located on pedal cluster.

Note:

The switch must only be fitted once to ensure that it is sufficiently tight.
 
 
 
→ Fig.13    Cruise control switch -E45

Fitting location: Cruise control switch is located at steering column switch.
 

[ZibAudi]

Thanx a bunch fellas. It's been real.  I love the way the Audi looks and drives but it's been nothing but a headache since I bought it.  Just got approved for a loan so I'm letting this baby go while it's still got some equity on it (around $2500).  I think I'll dive into the Audi world once more when I'm financially able to keep up with it.  Maybe a S4 next time.  Getting my Acura TSX this weekend. later pplz!