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General Information => Troubleshooting => Topic started by: coke on January 16, 2011, 10:15:05 pm
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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.
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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
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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.
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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.
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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.
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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.
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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.