AUTOMATIC GEAR LOCKING PROBLEM

Hello Friends, I have a 2003 model 307 XT Premium. It was 138,000 km. I bought the vehicle about 3 months ago. I want to share a problem that happened to me today. Please help ... My vehicle has locked in D mode today. Normally, the gear changes that occur at 2500-3000 revs take place over 4000-5000 revolutions or not at all. As the car shouts, it shouts. When switching to manual mode, the indicator remains in D and manual gear changes are not possible. This is the first time I have encountered a malfunction in this way. I stopped and waited a while. Then when I started the car, I saw the sign (-, *, S) on the screen showing the gear position. I put it in D mode and then started using it again. After going on normally for a while, he locked it again. Meanwhile, the temperature indicator climbed to very high levels. The vehicle is LPG, but I do not have clear information about when it was installed. When I got the car, the engine malfunction lamp was on and it was giving Antipollution Fault error. The person I bought said it was due to having LPG plugged in. He said that he was dealing with himself, but some kind of malfunction lamp did not go out. Before buying the car, we connected it to the computer and the master turned off the malfunction lamp. Then it started to burn again. In some comments, it was mentioned that the problem can be solved by solenoid replacement. I ask the friends who have happened to him. Did you happen this way too? Or has the solenoids been tried and replaced by changing the gearbox structure? Did you use Mobil LT71141 as transmission oil? If none of these are, how was it resolved? Does the hydraulic unit need to be replaced. Is there anyone who has encountered a malfunction in this way? If it helps, I would be very pleased. I live in Nevşehir, my priority is the authorized service, but there is no Peugeot authorized service here. Is there any special service or skilled craftsman who you can recommend, master the subject and solve my problem? Or, the nearest service to me is in Kayseri. İnciroğlu and Zabunoğlu. Which would you recommend? I want to make a point shot. So I don't want everyone to turn the car into a test board. I have neither time nor money to do this anyway. It may be in Ankara or Konya services that will relieve my troubles on this matter. Thank you very much in advance for your interest, relevance and help.

Hello, I have a similar problem. Why is it similar, the first one is my car gasoline, the second one is mine (206 / 1,4) has not made any errors yet. D has not yet been locked up, but when there are gear changes at high revs, I switch to manual. Actually, the vehicle is both serial and more economical. I haven't had the opportunity to go anywhere other than the service yet (it did not do anything when there was no error in the service) .. But I suspect the oil because they are working with oil pressure. This time I am thinking of going somewhere in the industry, if my work permits.