16705/P0321 - Engine Speed Sensor (G28): Implausible Signal

Help! Was taking inlaws to the airport, when on the interstate the car stalled out. Would not start again. Glow plug light was flashing. A few hours later it did start, ran for about 60 seconds then stalled again.

Pulled code, saw a 16705/P0321. Did search in this forum topic, and found nothing.

Not sure if this is only coincidence, or an important clue. Friday morning, before the fateful trip when this occurred, I isntalled a new Bosch O2 sensor. Is it possible that a wire or connector tat was marginally functional got knocked somehow to trigger this condition?

Some questions:
1) where is this sensor and related wiring on the BHW engine?
2) Is it likely I need to get a new part and install it, or should other things be considered?
3) what is the VW part number? Recommendations on where to get it?

Vehicle Speed Sensor (B5.5)
OEM Part Number: 01F409191
from http://www.idparts.com/vehicle-speed-sensor-b55-p-5695.html

anyone have information on how to troubleshoot or replace this part?

That's the Vehicle Speed Sensor (G22) not the ESS (G28). The ESS is on the driver's side of the engine behind the oil filter housing.

I just got the car back from the garage yesteday. He installed an engine speed sensor, consistant with 1854sailor's post. It was about 2hours labor to diagnose and replace the part.

I'm a little disappointed that I didn't get the old part returned, but mostly glad the car is running again. I received a note from 1stvwparts.com that the sensor for a G28 code would be the impulse sendor, part number 038-907-319E, from ETKA, in case anyone wanted to know.

Glad you got it fixed, but you already had the code, so they didn't really need to "diagnose" anything, and it takes 10 or 15 minutes to replace the ESS... Was this a dealer?

G22 on trans just behind oil cooler feeds the speedo

G28 on the engine block just behind the oil filter feeds the ECU

afarfalla said:

...G28 on the engine block just behind the oil filter feeds the ECU

Click to expand...

There's an echo in here...

Yea I echoed your reply wanted to make sure he was awake I was just wondering which one is the problem? would the one feeding the speedo cause a no start?

I'm in the beginning stage of putting together a circuit that would optimize the torsion value for our engine. G40, G28, G22 and injector 1 are involved, I want it to adjust itself for any errors, I'm shooting for usec correction increments. I'm trying to keep dementia at bay

afarfalla said:

G28 on the engine block just behind the oil filter feeds the ECU

Click to expand...

For more information about this: http://forums.tdiclub.com/showthread.php?t=411903

Also note that G28 one of the single-point-of-failure parts in some engines (I don't know about BHW specifically, I have AJM). I'd get a new OEM part to be sure that I don't end up with the engine stalling on the highway like last time this part failed.

mikko.rantalainen said:

For more information about this: http://forums.tdiclub.com/showthread.php?t=411903

Also note that G28 one of the single-point-of-failure parts in some engines (I don't know about BHW specifically, I have AJM). I'd get a new OEM part to be sure that I don't end up with the engine stalling on the highway like last time this part failed.

Click to expand...

Thank's for posting this link. I didn't realize that the bolt was 12 sided. I made a couple of feeble attempts to remove it with a 6 point socket, but gave up. Fortunately, I do not think I did enough damage to the bolt to prevent its removal.