Error code 0206 and 0306

Hi and thanks for using 2CarPros.

The 206 is the cause of the 306. It is related to the fuel injector. Either the injector, the wiring, or something with the powertrain control module (PCM) is bad.

Lets start with the injector itself. What I want you to do first is to follow the steps in this link:

https://www.2carpros.com/articles/how-to-test-a-fuel-injector

Or, simply switch injector 6 with a different one and see if the misfire changes cylinder. Here is a link that shows in general how to replace an injector.

https://www.2carpros.com/articles/how-to-replace-a-fuel-injector

Here are specific directions for replacing an injector on your vehicle. The attached pictures correlate with these directions.

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FUEL INJECTOR - INSTALLATION
3.5L

Pic 1

NOTE: Inspect each O-ring seal on all the fuel injectors, replace O-ring seals if any damaged is noted. Note the fuel injector O-rings are color coded. The Blue colored O-ring is for the fuel rail side and the Green colored O-ring is cylinder head side.

NOTE: If individual fuel injectors are being replaced, return the remaining fuel injectors to the original positions noted during removal.

1. Install and lubricate each fuel injector O-rings (1), (3) with a light drop of clean engine oil.
2. Install all of the fuel injectors (2) to the fuel rail (4), then install the retaining clip (5) to the fuel rail (4).

Pic 2

3. Inspect each fuel injector for proper installation. Note how the retaining clip (3) secures the fuel injector (1) to the fuel rail (2).

pic 3

CAUTION: The fuel rail bolts are actually lower intake manifold bolts. These bolts must be torqued in a mandatory torque sequence.

4. Insert fuel injector nozzles into openings in the cylinder heads. Seat the injectors in place. Install the fuel rail bolts and tighten bolts in a mandatory torque sequence to 28 Nm (20.5 ft. lbs.).
5. Correctly position and connect the fuel injector electrical harness connectors to the fuel injectors.

pic 4

CAUTION: Make sure the fuel line quick connector is connected properly. Failure to connect the fuel line correctly may result in a fuel leak at the rail assembly. Fuel leaked onto a hot engine may ignite resulting in damage to the vehicle.

6. Connect quick connect fuel line to fuel rail.

pic 5

7. Connect all fuel injector electrical connectors (1) to fuel injectors (2).

pic 6

8. Install upper intake manifold, See: Intake Manifold > Removal and Replacement > Intake Manifold - Installation.
9. Connect the negative battery cable, tighten the nut to 5 Nm (45 in. lbs.).
10. Use the scan tool ASD Fuel System Test to pressurize the fuel system. Check for leaks.

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As I mentioned, there is a 99% change that the injector is causing the problem and not plugs or the coil. Follow the directions in the first link that show how to test an injector or switch the injector with a different one to see if the misfire changes cylinders and let me know the results.

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I noted that you indicated little knowledge. Here is are a few links you may find helpful.

https://www.2carpros.com/articles/how-to-use-a-test-light-circuit-tester

https://www.2carpros.com/articles/how-to-use-a-voltmeter

https://www.2carpros.com/articles/how-to-check-wiring

Let me know if this helps or if you have other questions.

Take care,
Joe