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Could be a thousand different things. Probably the least likely thing would be the transmission. It would be rare for a transmission problem to set an engine service code. You will need to get someone to DIAGNOSE the problem and that involves more than just reading the codes. The code tells you what is being effected by the problem, not the nature of the problem. The code will tell the mechanic what diagnostic procedure to follow. The mechanic will then need to follow that procedure to diagnose the problem. If the mechanic says that the "code" tells him to replace a particular part, run away and find a mechanic that has a clue. The mechanic should tell you that he has followed a particular procedure and that testing has led him to a specific diagnosis.
 

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That is just reading a code. The code does not tell you what is wrong no matter how much Auto-zone would like to make you think so. They sell allot of unneeded parts by offering to read the codes for free! The code tells you what is being affected by the problem. For example the code may tell you that the oxygen sensor is reading out of specs. Auto-zone tells you that the oxygen sensor is bad and sells you a new oxygen sensor. The oxygen sensor may be fine, but the reading is out of specs because the engine is running too rich or too lean. It could be caused by a bad spark plug or 100 other things! Someone has to do the diagnostics, not just "throw parts" at the problem hoping to get lucky! Of course sometimes they get lucky, "even a blind squirrel finds an acorn occasionally".
 

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Discussion Starter · #9 ·
That is just reading a code. The code does not tell you what is wrong no matter how much Auto-zone would like to make you think so. They sell allot of unneeded parts by offering to read the codes for free! The code tells you what is being affected by the problem. For example the code may tell you that the oxygen sensor is reading out of specs. Auto-zone tells you that the oxygen sensor is bad and sells you a new oxygen sensor. The oxygen sensor may be fine, but the reading is out of specs because the engine is running too rich or too lean. It could be caused by a bad spark plug or 100 other things! Someone has to do the diagnostics, not just "throw parts" at the problem hoping to get lucky! Of course sometimes they get lucky, "even a blind squirrel finds an acorn occasionally".
Didn't take to autozone - took to a bmw dealer. It's not my first go around with bmw's my friend.
 

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Discussion Starter · #10 ·
That is just reading a code. The code does not tell you what is wrong no matter how much Auto-zone would like to make you think so. They sell allot of unneeded parts by offering to read the codes for free! The code tells you what is being affected by the problem. For example the code may tell you that the oxygen sensor is reading out of specs. Auto-zone tells you that the oxygen sensor is bad and sells you a new oxygen sensor. The oxygen sensor may be fine, but the reading is out of specs because the engine is running too rich or too lean. It could be caused by a bad spark plug or 100 other things! Someone has to do the diagnostics, not just "throw parts" at the problem hoping to get lucky! Of course sometimes they get lucky, "even a blind squirrel finds an acorn occasionally".
There are two things that can cause a misfire in a particular cylinder, bad secondary ignition component or a clogged or bad injector. SIMPLE
 

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if you know so much about diagnosing (you've gone from saying it sounds like the tranny to saying it needs a tune up) why are you asking here and arguing with people trying to be helpful. change the injectors, coils and plugs.
enjoy!
 

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I don't care if it is Autozone, a BMW Dealer, or the Pope. In order to diagnose the problem someone will need todo the testing that is prescribed for the code that you are reading. Otherwise you can just start replacing coils and injectors and "hope" that you fix the problem.
 
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