Glow plug sensor/coolant sensor

[coke]

91 Jetta Diesel 1.6L NA

Is the sensor that feeds information to the glow plug relay the same part # as the one that sends the data to the instrument cluster for the gauge?

I can find a listing for gauge type, but not one for glow plug system. On my car, they are both black, 2 prong.

I ran into this issue 5 years ago or so but I can't remember what I found out.

[Quantum TD]

On the Rabbits, the sensor was the same for either, but was single-terminal.

On Jettas, there are 4 sensor colors AFAIK:

White= AC cutout on NA cars up to 1992 (2 terminal)
Brown= AC cutout for ECODiesel cars (4 terminal)
Blue= Fuel injection for digifant cars (2 terminal)
Black= Temp sensor for gauge, and prolly glow unit. (2 terminal)

If in doubt, try VagCat (which may be having problems currently), or Wagenstad.com

[coke]

Ok. I'll see what I can find there. I know they're both black on my car, but I do believe to verify I plugged the gauge wire into the gp sensor and it was all off.

[Vincent Waldon]

Yuppers... when they are single units they are the same.. be they brass or black plastic.

Eventually (AAZ) both sensors were put in the same housing.

[coke]

Never knew that.  I found two black sensors. One listed Gauge and one not listed. Gauge sensor was like 8 bucks, the other was 17.  Different part numbers, so I figure they had to have a different function.

[Vincent Waldon]

Hmmmm... different part numbers has me concerned that I may be full of it.

I'll check my ETKA... coulda swore they were the same.

EDIT:  yeah, ETKA says the single pin black sensor is 049 919 501 a 0-125C temp sensor used for the coolant gauge, glow plug relay, and oil temp gauge/MFA (if equipped).  It's got M10x1 threads, just like its brass predecessor.

The black sensor with two pins is a 171 959 481A 119C A/C cutoff switch.  It's got M22x1.5 threads.

[coke]

Mine doesn't have threads at all. Its held in the plastic coolant flange with them o-rings and clips.

Two pins, black. I saw two different ones listed at another website, I can't even remember which one it was.