Since I joined the Check Engine Light club last week, I reviewed some of the postings on this subject and came up with the following list of phrases used to describe the problem areas that have been associated with this warning light:
1. "intermittent misfires in various cylinders due to differences in octane ratings, plus additives"
2. "an air pipe in the intake,"
3. "burnt vacuum line in the secondary air system"
4. "vacuum"-related. Replaced some "vacuum" parts under warranty and now all is well."
5. "solenoid for an air injection pump"
6. Engine Thermostat
7. "car's water temp reached 220°F"
Some seem like realtively straight foreward problems in the air intake, fuel or temperature control systems.
However, we also have:
8. a transmission sensor,
9. a transmission control module
10. need a new torque converter
The transmission problems are very worrisome.
Last week, the service folks kept my car for two days. On the first day, they checked the emission system and vacuum lines and could not find a problem. They turned the light off and drove it for a while on the second day and pronounced it fixed.
The light came back on in two days and the car will be back in the shop tomorrow.
I have 2004 Phaeton with a V8 engine and have about 26,000 miles on it.
Recently Michael wrote about a "problem inside the torque converter. Funny thing is that the driveability of the car is not compromised - the car still works OK - but the torque converter needs to be replaced in order to turn the light out."
Michael, any more info from ZF Transmission? What is the answer to your question: Is the fault code that supposedly mandates replacement of the torque converter a) spurious, and b) related to cold temperatures?
When these transmissions have been replaced, do they find something wrong with them? Or is there a faulty sensor in the transmission responsible for the "false positive"?
Does the fact that both the 5 and 6 speed transmissions are having problems suggest a faulty sensor?
Have the new transmissions that are used to replace the originals been redesigned to prevent this "false positive" or to correct the real problems?
If not, I fear a number of owners may be stuck with replacing these $13,000 transmissions every 30,000 miles or putting some black tape over the CEL.