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E46 (1999 - 2006)
The fourth generation 3 Series (E46 chassis) was introduced in 1999 and set the standard for engineering and performance during it's years of production including being named to Car & Driver's 10 best list every one of those years! ! -- View the E46 Wiki

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  #1  
Old 07-25-2015, 02:48 PM
Oldmactech Oldmactech is offline
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P0444 after replacing purge valve- what next?

325i wagon 2001

Wife's wagon throws an intermittent EML code P0444 and P0174. Swiped gas cap with OEM and still on about 1/2 time.

Needed to pass emissions in GA so I swapped the EvAp purge solenoid and the Check light went off immediately and made it through emmissions inspection a few mins later. 10-12 miles later came back on.

I'm certain the hoses were connected property but will check again. Good continuity at the electrical, all reconnected properly.

Any other diagnostic tips would be appreciated.

Thanks.

Jb
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  #2  
Old 07-25-2015, 02:53 PM
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After doing a repair and clearing the codes, it normally takes a few driving cycles of 15 miles or more before the sensor light goes away for good.
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Old 07-25-2015, 03:00 PM
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ahull ahull is offline
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Quote:
Originally Posted by Oldmactech View Post
325i wagon 2001

Wife's wagon throws an intermittent EML code P0444 and P0174. Swiped gas cap with OEM and still on about 1/2 time.

Needed to pass emissions in GA so I swapped the EvAp purge solenoid and the Check light went off immediately and made it through emmissions inspection a few mins later. 10-12 miles later came back on.

I'm certain the hoses were connected property but will check again. Good continuity at the electrical, all reconnected properly.

Any other diagnostic tips would be appreciated.

Thanks.

Jb
EDIT: You're still getting the same codes with new valve?

I can't speak from experience on this but I'll offer some thoughts:

IMO That specific of a code would seem to still indicate the purge valve. Did you swap in a new valve or a used one? There may be some other condition that is taxing this valve and a used one might repeat the failure mode of the first.

I suppose the other thing you could do is try to examine and or test continuity on the connector through the harness. There's a picture of the box in the wiki electrical section:

e46 wiki: http://www.bimmerfest.com/forums/sho...05#post8014505

At this age connectors get loose, and or oxidized, as does wiring. Ground wires also become suspect. This thing also has two vac hoses on it too, I think. Probably not related but again, on a 14 year old car the rubber/plastic is toast, and the wiring may not be that far behind. They don't really make em to last 30 years anymore, and that's a bummer bc e46 is a classic.
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Last edited by ahull; 07-25-2015 at 03:03 PM.
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Old 07-25-2015, 03:52 PM
Oldmactech Oldmactech is offline
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Thanks, I didn't clear the codes, cleared themselves. Might need a few cycles and I did clear it after it reappeared.

Good continuity at the purge valve connection but I never heard an expected click when my wife turned the key on prior to cranking.

Luckily it passed emissions s I have a year to get it sorted out.

Jb
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