Hello together, once accepted A visits a car with gas system and B assures him that the TÜV is made new as well as a complete large inspection including change of timing belt and water pump etc. .B sends after the TÜV A the TÜV certificate that he has passed through the TÜV and wants to pick up the car as agreed with B. In the TÜV notification the gas system is still included. A assures the car and allows it and wants to pick it up, then he is informed that the Ga A has made 1000 euros of 2900 euros down payment. A wants the car to be repaired as agreed, that car was offered with car gas and so it also wishes A to be handed over. B wants the gas system to be repaired only if it is economical, otherwise it is not thought of by B. Does B have to provide the car as described in the offer after down payment or can he withdraw from the purchase contract? Must B incurred costs for the registration of insurance, admission, green posters, travel costs by public transport etc. take over at the withdrawal of the contract? Thank you!! Greetings