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Quick thoughts on intermittent stalling

1729 Views 9 Replies 6 Participants Last post by  MegNMoo
2006 2.5L Automatic Beetle

My wife's new to us beetle dies from time to time when slowing to a stop or when stopped at idle.

I get codes P0101 (MAF out of range), P0172 (rich), and P2279 (leak in intake system)

To me, these point to an air/vac leak but I would expect a leak to cause a lean condition not a rich condition so I am a bit confused. I have not dug in too deep looking for vac leaks but did not see or hear anything glaringly obvious.

Could anyone supply some direction or are there any common faults I should look into first based on these codes and conditions.

Thanks for the help for a new member and 1st time poster!
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Rich conditions are rare, usually only when the EVAP system has a problem.

Also many of the Rich codes can be misleading.

See if you can get a reading on Fuel Trims as these should give you an idea if the P0172 code is likely correct.

The MAF out of range could be causing the rich condition. See if you can get a Grams/Second reading on the MAF at idle and also see if the OBDII tool will display engine load. If you can get the engine load to display over 100% when driving only slightly spirited, then the MAF may somehow be OVER reporting the airflow, which is VERY uncommon.
I'm only going to say it once....crank shaft position sensor is dying.......ALL of your codes are meaningless because the crank shaft sensor is failing and causing the car to go rich etc......I've mentioned this in multiple posts in the past. Simple fix. Once you mention car dies when stopping at red lights or just before starting to get going when the light turns green its always the sensor. Plagues all New Beetles ALL model years eventually the sensor goes. Codes don't show for it. The situation becomes dangerous as cars think your about to go but you never do and the car dies on the spot with everyone beeping around you.
My car is experiencing the same thing (minus the stalling). She is running very rich and threw a code saying something along the lines of "Crankshaft sensor A" being bad. I've heard these are a bear to change, but I cannot find anything on this site detailing the replacement. Could you point in the direction for more information about this?
There is indeed information on this site on replacing the engine speed sensor. I know because I put it there:

The part is called a crank shaft sensor NOT a speed sensor. The speed sensor is a part associated with the transmission NOT the engine block. The description in the link is correct though, just the name is wrong; and no you don't need to remove the oil cooler it is quite easy to get to with the socket. Replace with only a Bosch sensor, other sensors have problems with the New Beetle ECU recognizing them. Check eBay or wherever and search for New Beetle Bosch CRANK SHAFT SENSOR.
If you want to find the correct BOSCH sensor/parts; use the official auto parts finder (be sure to get your engine code off your timing belt cover/sticker):

Bosch Vehicle Part Finder
The part is called a crank shaft sensor NOT a speed sensor.
"Engine Speed Sensor" is indeed correct. It is the name used by the VW service manuals. The function of the part is a crankshaft position sensor, but VW has chosen to name it "Engine Speed Sensor." The sensors in the automatic transmission are called "Transmission Vehicle Speed Sensor" and "Vehicle Speed Sensor."

I agree it is confusing, but if you want to use the name that the manufacturer has given their own part, then you will call it the "Engine Speed Sensor."
Beautiful! I found in the Haynes manual the Engine Speed Sensor and it appears the be the correct part. Thank you for the information.
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