Question about 2006 Volkswagen Jetta
The code 201 refers to an injector circuit open. What this means is if you ohmed the original injector and it had says 15 ohms or any number that would mean the injector is closed so the injector is not the fault. What alot of cars will do is shut off the injector when a misfire is felt to protect the catalytic converter from burning up and setting a 420 code. 420 means replace the cat if nothing can be found wrong. So with this in mind we know the car will run ok till it starts running rough. This tells me the computer is doing what it is suppose to do. What I would do now if I was you is check the plugs and swap #1 with say number 2. also swap the coils, 1 with 3. Then clear the code and see where the code ends up now. If you still have a code for 1 you could have a intake vacuum leak or a small hose could be leaking somwhere and it just so happens to affect # 1 first. If you have two coils for 4 cylinders this is called a DIS system. Most likely the coil is not the issue because you would set a code for two cylinders. But not always. So if the coils can be swapped try that also
Posted on Nov 18, 2009
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Posted on Jan 02, 2017
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P0300?? Multiple Cylinder Misfire
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are the codes start with the basics inspect plugs wires cap rotor and if all checks out do a compression test
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