Hello, you don't need two signatures. Is this car registered in the woman's name or in your name? If the woman's name is registered on the car, then the woman has the right to dispose of it when she sells the car. As long as it is based on the true intention of both parties and a reasonable consideration is paid, the registration and delivery are completed without the signature of two people.

But even if the woman sells the car alone, because it is during the marriage, the consideration is still the joint property of the husband and wife. If you want to divorce in the future, you still have to divide the marital property.

However, if you think that the woman's sale of husband and wife's property infringes on your property interests, you can collect and master the legal evidence of the woman's resale of property. When divorcing, you can claim that the woman has less points, or you can claim that the husband and wife have the same property.

Article 1092 of the Civil Code: If one of the husband and wife conceals, transfers, sells, damages or squanders the joint property of the husband and wife, or forges the joint debt of the husband and wife in an attempt to seize the property of the other party, the husband and wife may divide the joint property less or not. After the divorce, if the other party finds the above-mentioned behavior, it may bring a lawsuit to the people's court and request to divide the husband and wife's property again.

Article 1066: During the marriage relationship, one of the spouses may request the people's court to divide the common property under any of the following circumstances:

(1) One party conceals, transfers, sells, damages or squanders the property of the husband and wife, or forges the debts of the husband and wife, which seriously damages the interests of the husband and wife;

(two) one party has a legal obligation to support the person who needs medical treatment because of a serious illness, and the other party does not agree to pay the relevant medical expenses.

Article 28 of Interpretation of Marriage and Family in Civil Code (I): If one party sells the house jointly owned by husband and wife without the consent of the other party, the third party obtains it in good faith, pays a reasonable consideration and has registered the real estate, and the other party claims to take back the house, the people's court will not support it.

If one spouse disposes of all the houses without authorization, causing losses to the other spouse, and the other spouse requests compensation for the losses during the divorce, the people's court shall support it.