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Old 10-04-2011, 12:51 PM   #1 (permalink)
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Default Verona 2006, P0171 and P0174 codes.

What could be possible more common issues to set P0171 and P0174 codes in Verona 06? I've checked for vacuum leaks everywhere, used external fuel supply (sprayed break cleaner on all vacuume lines) could not locate any leaks. But I did not do a smoke test.
Could be PCM update? But I assume that Verona 06 has newest software...
MAF sensor? Previous owner installed cheap, aftermarket MAF sensor, and I am not sure if Verona is very sensetive to OEM sensors.

Also, if I clear the codes, almost everytime - I am getting P0171, P0174, and P0605 codes together... Are they related? Help.
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Old 10-04-2011, 01:19 PM   #2 (permalink)
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Check the back corner of the engine near the EGR valve, there is a PVC valve that's famous for cracking and sucking air..
Also use your ears. Listen for hissing air being sucked in..
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