Question about 2004 Volkswagen Jetta

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Check engine light

My check engine light is on and I got a diagnostic and they said it was my ect sensor and I am trying to find out where it is located on a 2004 jetta

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  • Chris Johnson Feb 04, 2009

    2004 Jetta 2.0 ect sensor went bad

  • Bob Curtis May 11, 2010

    Do you know what the original code was? I'm guessing it was a P1255 or P1256 which are for engine coolant temp sensor short to ground or short open respectively. Either way you can fix it by replacing the little green ECT sensor with a new one. I'll need to know what engine your car has to tell you where it's located though.


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It's just to the drivers side of the valve cover. Attached to the coolant flange under the hose for the PCV. In this pic if it works.

HERE if it didn't work.

I posted on both these just in case someone finds it while searching.

Posted on Feb 03, 2009

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1 Answer

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The ect sensor is the coolant temperature sensor depending what engine you have this video should be more or less the same if not look toward the top hose that goes to the engine

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Coolant sensor replacement

The exact locations and picture of Engine Coolant Temp (ECT) sensors on 2001 VW Jetta TDI:

1. ECT sensor 1 placed on cylinder head:


2. ECT sensor 2 placed on the left bottom side of the radiator:


Apr 28, 2011 | 2001 Volkswagen Jetta TDI

1 Answer

The check enging light comes on then goes off. I foud out the code po118 engine coolant temp circut high input. is it the coolant temp sensor. if so how do I replace it. It is on a 2004 jetta tdi

According to

Because ECT (engine coolant temperature) sensor procedures vary depending upon their location, first locate the part. You may need to partially drain the engine coolant to prevent coolant spillage.
  • Disconnect the negative battery cable.
  • Unplug the ECT.
  • Then, unscrew it.
  • Reverse the removal procedures to install the new part.
  • Connect the negative battery cable to the battery.

    Related Parts:
Coolant Temperature Sensor printpage_icon.gif

0900c152801bfc38.jpg enlarge_icon.gifenlarge_tooltip.gif

Fig. Remove the coolant temperature sensor
The coolant temperature gauge sensor is a temperature-variable resistor, or thermistor. As coolant temperature increases, the resistance of the sensor decreases or decreases, depending on the type of sensor.
A1 and A2 platforms use a different type of circuit that A3 vehicles. On A1 and A2 vehicles, the circuit is a "resistance to ground" type. A3 vehicles use a "variable voltage" type, where a voltage is supplied to the sensor. Because of the circuitry design on A3 vehicles, testing of the coolant temperature gauge is limited.
The engine coolant temperature gauge uses a heat sensitive sending unit to transmit an electrical signal to the gauge. The sending unit is a heat sensitive variable resistor that is located on or near to the cylinder head and threads into an engine coolant passage. The sensors are a Negative Temperature Coefficient (NTC) type. As the temperature increases, the electrical resistance of the sensor decreases. As the coolant temperature changes, so does the resistance of the sensor. The gauge is calibrated within the operating range of the sensor and interprets the resistance value to display the coolant temperature.
Beginning with model year 1994, the engine coolant gauge and the Engine Control Module (ECM) temperature sensors were combined into one sensor with 4 terminals. The basic operation remains the same in that their resistance decreases as the coolant temperature increases, however the actual resistance values of the 2 sensor circuits are different. The electrical connector of the 4-wire terminal sensor ( 1 and 2 ) is keyed to prevent improper connection of the sensor's electrical circuit.

0900c152801bfc39.jpg enlarge_icon.gifenlarge_tooltip.gif

Fig. Beginning with model year 1994, the Engine Coolant Temperature Sensors combined the sensors for the ECM and the gauge into one sensor-1997 2.8L V6 sensor shown

0900c152801bfc3a.jpg enlarge_icon.gifenlarge_tooltip.gif

Fig. The electrical connector for the combined temperature sensors is keyed to avoid improperly connecting the sensor's wiring-1997 2.8L V6 connector shown

Oct 17, 2010 | 2004 Volkswagen Jetta

1 Answer

Need exact location and picture of coolant temp sensor on tdi vw jetta 2004 please Thanks

The exact locations and picture of Engine Coolant Temp (ECT) sensors on 2004 VW Jetta TDI:

1. ECT sensor 1 placed on cylinder head:


2. ECT sensor 2 placed on the left bottom side of the radiator:


Sep 21, 2010 | 2004 Volkswagen Jetta

1 Answer

I own a vw jetta,2004 model. The check engine

Must hookup computer scanner to obtain diagnostic codes. Problem must be repaired to keep light off.

May 09, 2010 | 2004 Volkswagen Jetta

2 Answers

I changed the thermostat on my 2004 jetta 2.0L and it keeps overheating i checked water pump and it is good what should i do now

Hi, could be the head gasket, have a compression test done to determine pressures etc, with the engine running see if you can smell exhaust fumes coming out of the radiator filler, good luck.

Feb 24, 2010 | 2004 Volkswagen Jetta

2 Answers

Need to fing location of ECT sensor on a 1.8L turbo 2004 jetta

Take off the two covers on top of your engine. The ECT sensor should be on your right side of the engine. It may be either black or green and has a 4 blade connector. There is a plastic clip you slide out to replace the sensor. Hope this helps. Only takes a few minutes to replace

Feb 06, 2010 | 2004 Volkswagen Jetta

1 Answer

Location of the ect sensor

It's just to the drivers side of the valve cover. Attached to the coolant flange under the hose for the PCV. In this pic if it works.

HERE if it didn't work.

Feb 02, 2009 | 2004 Volkswagen Jetta

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