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Discussion Starter #1
My 2002 1.8T is throwing 5 codes: P0171 (mixture too lean) and P0300-P0303 (misfires). I recently replaced the MAF and the spark plugs, and I couldn't find any vacuum leaks. Any idea what the problem could be?
 

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any problems while driving car? flashing CEL?
 

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Ya, it shudders on hard acceleration and the CEL will sometimes flash, but if I back of the gas it goes away.
Its a coil pack. what gear does it happen in?
 

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****, I was hoping that wasn't the case... I replaced the coils in '08, would they be bad already? It happens in 3rd and 4th.
Im pretty confident its the coils but wait until someone else chimes in. lol
 

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My 2002 1.8T is throwing 5 codes: P0171 (mixture too lean) and P0300-P0303 (misfires). I recently replaced the MAF and the spark plugs, and I couldn't find any vacuum leaks. Any idea what the problem could be?
Yeah looks like your coil packs in cylinder 1 2 and 3 are misfiring.
 

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****, I was hoping that wasn't the case... I replaced the coils in '08, would they be bad already? It happens in 3rd and 4th.
Coil packs go quick, they're notorious
 

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So would that explain the other code as well (P0171, mixture too lean)?
Not sure, possible though.
I was having coil pack problems,which I just replaced.
And I was also having a mixture too lean code.
If I can get my dam codes cleared, well see if the Lean one comes back
 

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Discussion Starter #11
Not sure, possible though.
I was having coil pack problems,which I just replaced.
And I was also having a mixture too lean code.
If I can get my dam codes cleared, well see if the Lean one comes back
Alright, well I'll swap those out, see if it fixes it. Thanks!
 

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yeah that's coil packs if it's not your plugs since you just replaced those, but idk why they would be bad so soon
 
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