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Old September 30th, 2019, 20:23   #1
Join Date: Aug 2019
Location: Ventura
Default 2002 Jetta MKIV temp/fuel non responsive.


Been the best car I have ever had. Canít get the temp sensor or the fuel gage to do anything. Checked fuses, replaced coolant temp sensor, pulled the fuel level/filter and replaced. No luck.


Anyone heard of this? Canít pass smog in Southern California without having it run a drive cycle.

Runs like a champ, of course-

Any insight greatly appreciated-
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Old September 30th, 2019, 22:34   #2
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Join Date: Jul 2007
Location: Portland, effing Oregon

What's a drive cycle?
Does everything else in your instrument cluster work properly?
All indicator lights come on when you key ON?
Has the car ever had water leaking into the cabin?
Any recent work done?
Your answers might help someone else more efficiently diagnose your issue! You also might consider that your car wants to move to Texas
2003 Jetta TDI 1.9L 5-speed
Malone Dynamic EGR ~ cooler delete ~ Euro pipe ~ ventectomy
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Old October 1st, 2019, 04:41   #3
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Join Date: May 2012
Location: Asheville, NC
Fuel Economy: 38mix / 47@70-75

I'm guessing you put a new radiator temperature sensor in and need one for the back of the head. Fuel sender/pickup probably needs replaced.
I'm assuming if you get the coolant sensor working it'll pass as I don't remember any regulations saying you have to know how much fuel you need.
'02 1.8t Jetta Wagon Alh w/5spd swap, SB 21#SM DD, bew lift pump, 11mm IP, VNT17, Malone stage4 tune, Stealth pipe, BMW Cyclonic CCV filter, 2.5"cat back st. pipe,Vr6 brakes, 2" lift, Panzer, Bilstein HD, fill tube ectomy, soon to be Bosio DLC 1020's PD_fuel_delivery TDI Search Plug release tool Howto terminal release tools VW/Audi

Last edited by eddieleephd; October 1st, 2019 at 04:44.
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Old October 1st, 2019, 06:34   #4
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Join Date: Dec 2001
Location: St Louis
Fuel Economy: fantastic

OBD works, should've started there. The Instruments communicate through the DLC, same as the rest of the modules on the CAN bus. You can see if it has any DTCs, and see if it is reading the correct values from the sensors (you can even do an output test to make the gauges sweep). I suspect the problem could be a bad solder joint, possibly on a shared voltage stabilizer, inside the cluster.
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Old October 10th, 2019, 05:40   #5
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Join Date: Oct 1999
Location: Conkud, New Hampshiyuh, USA
Fuel Economy: pretty freakin' good.

Once in a while the resistor sweep in the fuel sender/pickup in the tank needs to be wiped off. That wouldn't explain the coolant temp though. I'd go with OH's advice first.


You always pay for what you get. Sometimes you get what you pay for.
It is called dope because it does make you dumb.
Thinking outside the box is difficult for some. They're afraid they'll fall off the edge of the box and be lost to oblivion.
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