When the car engine is not working smoothly, you must test the car engine in the automobile repair center. The car engine P1842 Code is found after testing the car engine. You should check the choke plate of the car engine manually. Is parts positioned correctly and you should check it is still working or not? Does it open totally? If you are not satisfy, then you either change it or restoration it. If the component is damage, then it is suggested to put down your repair tools and start looking about for a spare choke plate to avoid a recurrence of this horrible event.