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    Thread: Recurring code P2181, Cooling System Performance 03' 2.0 Jetta

    1. 04-22-2006 12:03 AM #1
      I have read around and found that replacing the black engine coolent temp sensor with the new green one, will help rid the P2181 code. I have done this with no problems, cleared the OBD2 code. The car runs fine, no different from before the sensor. For 3 days now no code came up until today, any clue on what to do next? Thermosat? Or just take it to the dealer? Engine temp is at steady 190 deg at normal running temp, car has about 66k miles on it. Its my gf's car, stock, and very easy driver with tons of freeway miles.

    2. Member
      Join Date
      Feb 12th, 2004
      raleigh, nc
      98 audi a4, 83 jetta
      04-22-2006 03:55 AM #2
      double check the electrical connection on the sensor
      instead of taking it to the dealership, find a local trusted shop in the area if you can...

    3. 04-22-2006 06:33 AM #3
      Are you in OC, Cali? Any place you could refer me too? I want my gf to stay away from the dealer they suck!

    4. Senior Member bluefox280's Avatar
      Join Date
      Dec 17th, 2003
      Broomfield, CO
      04-22-2006 10:47 AM #4
      With a VAG-COM, look in Measuring Blocks, Group 1, second field.
      That's the what your ECU *thinks* the Coolant Temperature is.
      Do this before starting the engine, after it's been sitting overnight.
      The if it's not within a few degrees of ambient, then either the temp sensor is bad again, or the connection between the temp sensor and the ECU is bad.
      If the sensor is good, you may be looking at a thermostat issue.
      - Erik
      PatternDraftImaging.com - "...Where Engineering Discipline and Photography Merge as One..."

    5. 04-22-2006 12:40 PM #5
      If you have acess to a vag-com you can also look at the OBD-II readout of whent he faultcode set. Lately I have seen the fault for Thermostat malfunctions! It usually opens early!

    6. 04-22-2006 06:00 PM #6
      I dont have access to a vag-com. Since a thermostat is relativly cheap should I swap that before giving in and taking it to the dealer? Any guides on that? Im a neewb to working on cars, but from what I understand an idiot (such as myself) can do it

    7. Member formerly vr6 karl's Avatar
      Join Date
      Jan 26th, 2003
      in a toilet
      03 gti / 04 r32
      04-24-2006 05:50 AM #8
      yeah, ive had the code pop on mine too.......the dealer suggested a wire replacement (something about water getting into a connector and making the wires go bad)........i declined the repair $120 for $6 worth of parts
      i recently replaced the timing belt and thermostat and the cel went away-----im sure the code is still in the memory tho, i need to get it scanned/cleared

    8. Member blkmgc20's Avatar
      Join Date
      Jul 10th, 2003
      Annapolis, MD
      '15 335i, '15 MB C400, '03 CR-V
      05-04-2006 03:34 AM #9
      bump. I've had the same code intermittently for 6 months. Does anybody have a solution??

    9. 05-06-2006 01:24 PM #10
      I've had this code for too long im wondering how to get rid of it. 2003 Jetta with a couple of mods done as AEM Cold Air Intake and Borla Cat back Exhaust.

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