@circuitsmith, how I love to hear some hope! Many thanks! Unfortunately any history for this car is scanty. The car has fallen into my wife’s hands after her sister cannot drive. For several years I have checked the car occassionally, and each time I have said “this car has a transmission problem”. But it has been checked by good mechanics severally, even had a transmission flued changed I think a couple of years ago, but no one has ever said that it has indeed turned up a Transmission diagnostic error code. Then just recently I drove it, and felt it had gotten too bad. I tested it with my cheap reader … and there it was, P0811.
The car was just coming from a shop, and P0811 was not among the error codes the shop read. So I am wondering whether their readers have always missed this error code, or if the error code became readable just before I made my reading. What a coincidence that would be!
Anyway, now I would like to fill up with ATF and see what happened. But I am challenged … I cannot find where this car’s ATF is supposed to be filled from. Would you have directions for me here? The ATF system is closed for this car, in that there is no dip stick, but there has to be somewhere to fill it through.
As for Code P0030, I suspect the culprit is a breather hose that I find broken, connecting the intake (just close to the MAF Sensor location) and the engine. I will need to track this hose and replace it in full. It is a hard hose and there is hardly a way to repair it.