09 Audi A4 2.0T P0300 P0303 P0304

[JohnnyR9822]

Hello, I own a 2009 Audi A4 2.0T Turbocharged FWD and I got 3 trouble codes (P0300, P0303, P0304). My audi drives fine but it idles rough and lost a bit of power. What I first did was I changed all spark plugs to new stock ones and the misfires was still on cylinder 3 and 4. I tried swapping the coil pack to different working cylinders but the misfires was still on 3 and 4. Another thing I did was I added San Lucus fuel injector cleaner and didn’t seem to solve the problem. Last thing I did was bought a PCV valve and didn’t solve it. I ran out of ideas and don’t know what the problem could be. Any ideas? Thanks! Btw my car milage is 188k

[Grouch]

Boost leak?

[mbizzle]

Also what is the compression saying?


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[elpeterson]

I'm still new to the Audi world but experienced this on my Subaru. What's your mileage like? This could be coming from carbon build up. Normally I'd say check injectors, plugs and coil packs but it seems you've gone through that already.

[JohnnyR9822]

Also what is the compression saying?


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Compression cylinder 1-4 is 180-150-180-180

[JohnnyR9822]

I'm still new to the Audi world but experienced this on my Subaru. What's your mileage like? This could be coming from carbon build up. Normally I'd say check injectors, plugs and coil packs but it seems you've gone through that already.

My audi has 188k miles on it.


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[JohnnyR9822]

It could possibly be that. What are the symptoms of a boost leak?

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Boost leak?

It could possibly be that. What are the symptoms of a boost leak?

[Grouch]

It could possibly be that. What are the symptoms of a boost leak?

- - - Updated - - -



It could possibly be that. What are the symptoms of a boost leak?

I recently had a huge boost leak and basically had all the same symptoms as you. I was throwing bunch of misfire codes, rough idle and loss of power.

[JohnnyR9822]

So is it worth it replacing the whole turbocharger?


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[JohnnyR9822]

I recently had a huge boost leak and basically had all the same symptoms as you. I was throwing bunch of misfire codes, rough idle and loss of power.

So is it worth it replacing the whole turbocharger?


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[Grouch]

So is it worth it replacing the whole turbocharger?


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I would get a boost leak test done and see if that's really the cause. Usually about 100 bucks at the shop or you can do it yourself if you know how. Bunch of DIY on here on the forum.

[Jacon]

Have you replaced the injectors? That's very high mileage for stock injectors. Id start there.

[Sompse]

Old case, but have you ever solved the issue?