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I have an audi 2.0 tdi 125kw 2007 model. One of the injectors need to be changed. Do i have to change the other three as well and will they cause problems as well if it is not changed. The car has done about 95000 km

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Since one had failed and your car has clocked about 95000kms which is quite high for a change, it is ideal to have all the four injectors changed as this will ensure that there wont be any failure of fuel injection or poor performance for a long time. If not the others may follow suit in due course of time and so changing all FOUR is recommended.

Posted on Mar 15, 2011

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No chust one!

Posted on Mar 15, 2011

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How to bleed the fuel system in the 2009 Mondeo after changing the fuel filter on a diesel

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Good afternoon Michael

The good news is that you have power and your starter is working. If you can't get it started, and had rough idle before that, there are a couple of high likelihood directions to go, so lets start with the least painful.

For proper ignition, you need three things - air, spark, and fuel. If you get the wrong mix, rough running or none. Since you went from running rough to not turning over, you are likely being choked off from one of the vital three (An engaging starter is also needed, but it sounds like you have that)

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Lack of fuel would come from an old, clogged fuel filter, or clogged fuel injectors. Similarly, videos like this (
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Finally, lack of spark. When is the last time the spark plugs were replaced? Worn, corroded or fouled plugs will give you dismal performance. See (
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There are plenty of other things that could be the issue, but with the slow decline into rough running, the odds are pretty good that something in the above will get you running.

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Please do rate my response. Thanks!

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