Your concern about your car and the smog test has been heard and I have prayed for you.
God knows you need reliable transportation and He cares about the practical details of your life. Scripture teaches that there is not a need you have for which God has not made provision and given promises to cover it. At the same time we are warned to take care that we do not come short of what He has promised because of unbelief in our hearts. So bring this need to Him in simple trust, believing He is able to provide, and resting in His care whether the answer comes as you hope or in another way He sees is better.
It is also good to remember what Jesus said, you shall not put the Lord your God to the test. We are not to deliberately put ourselves in a place of risk or try to force God to act on our terms. If the car needs honest repair or proper maintenance to pass, the right path is to do what is honest and responsible and then trust Him with the result, rather than looking for a way around what is required.
This kind of waiting can also be a test of the heart. David prayed, search me and try me and see if there is any wrong way in me, because he knew the heart can be deceitful and only God truly searches it. Use this time to ask God to show you anything He wants to shape in you, to strengthen your faith, and to keep your trust anchored in Him and not only in the outcome of the test. Like Joseph who was tested through hardship and waiting before God lifted him up, the Lord often uses seasons of uncertainty to prove and deepen our faith.
It helps to keep perspective about material things. A car is useful and we can easily become very attached to it. A new car or a new possession can seem so important for a moment, and then a small dent or a little time passes and the shine fades. In a few years we are often tired of what once felt essential. All of these things are temporary and will not last, while what God is doing in your life and your walk with Him will remain. That does not mean the car does not matter, it simply means do not let worry over it steal your peace.
I also want to remind you of the greatest provision God has made. He has made only one provision for the forgiveness of our sin and guilt, through His Son Jesus Christ. The Spirit bears witness to this truth in our hearts. If you have not already, put your trust fully in Jesus for salvation, and then bring every other need to Him as your Father.
So I pray for you now. Father, in the name of Jesus I bring this need before You. You see this car and this smog test and the concern it has caused. I ask that You would provide what is needed, guide to honest and affordable help if repairs are needed, and grant favor for the test to be passed if it is Your will. Above all, give peace, strengthen faith, and guard the heart from worry. Help to trust Your promises and not to fall short through unbelief, and to keep eternal things in view while You care for daily needs. Amen.