Po340 Hello, I am getting a error code p0340, p0345, p0021 and p0011 on my 2001 vw passat. I have had the spark plugs replaced, but don't know why i keep getting this error message? Whenever I start the car it shakes after keeping it on for about 10 minutes it doesn't shake as bad?

SOURCE: 99 vw passat, when running, MIL lite, on car vibrates- shakes

no flashing light and rough shaking will be part of spark plug but also a very bad miss fire. I am going to guess that your engine is a 1.8t if so you have 4 coils that sit on top of your spark plugs that most likely are arcing you will need to figure out which coil is failing or you can save yourself the trouble and replace all 4 and the spark plugs. before you do that though check your wireing going to your coils look for broken wires or the ground that is next to the #1 coil that is the one closest to the front of the motor and you. hope that helps. that will be the start to fixing your issue also when you pull out the spark plug look down the hole first and make sure that there is not oil in the bottom of the hole if that is the case you will need a valve cover gasket as well. good luck hope that helps

Testimonial: "hey was help full, but no it was second coil, miss fire, $89.00, BUT VW wanted 350.00 to do what i paid and did my self ,lol,,thnks"

SOURCE: car (vw passat turbo 2000) shakes on up

its miss fireing could be anything causing it but more likely to be plugs as its doing it under load going up hills plugs is the first place to start

SOURCE: After start, eng. shakes at idle. 2001 VW Jetta

if it has a 1.8 coils are bad but check mass air meter and throttle as well