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2007 Audi A4 Quattro Questions

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All lights work, after an hour or so, will not start. But it will crank but won't catch.
My Audi just started making the tapping sound from the bottom of the motor and an Audi mechanic told me it is the timing chain extensior. How much will it cost for me?
Replaced the crankcase vent valve with OEM parts and light still hasnt turned off. I need help ASAP ive lost a lot of MPG and a lot of power!!!
When cutting the wheel either direction while moving forward at low speeds, there is a rubbing sound. This is especially noticeable when on bumpy surfaces.
Recently replaced the fuel pump. Now, the car drives but has zero power.
We have tried to replace the comfort module but it did not help. When I put the wiper fuse in they start and won't stop.
It would lose power only now and then and specially I when I step a bit more on the gas. And the engine light comes on and flashes for 4-5 times and goes away. What does this mean and am I able to fix it myself?
I have checked for leak and there seems to be no leak.. Now it's showing that the car needs to be serviced . Do you think anything is wrong with the gauge?
Run properly. Can anyone help me?
Throwing codes. P0442, p2293 and p0455. RPM fluctuate at 2000. And car kinda surges after 45 50 miles an hour it doesn't anymore.
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