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How to change a fuel temperature sensor on a vw

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Posted on Jan 02, 2017

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SOURCE: How do I change the temperature sensor under the

It’s located on the driver’s side of the engine on top /side of the head.. midway.. I don’t think you need to remove the engine cover to see it.. if it is the correct one it will have a dark green top.. the bad version has a black top… but they can all go out to lunch on you if old enough.

To replace.. make sure the car is cool..
You need a hood tool.. or small pair of pliers to remove the retaining clip that holds it in place.
Place a rag under and around it to catch the coolant.. you will lose less than a half a cup.. if that.

Pull the retaining clip back toward you.. try not to drop it.. (another good reason for the rag)

Wiggle the sensor.. pop it out.. and replace with the new green top one make sure you clean the area well.. and when you reinstall the new one that the c clip goes back on straight or it will leak.

Once you see the part out of the box.. you will understand how it works

Start the car.. check for leaks.. run until warm with the heater on.. top up the coolant overflow bottle with distilled water.. (if more than a half a cup.. you should mix the proper anti freeze and distilled water and then top up with that)

Good luck

Posted on May 06, 2009

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2004 vw passat w8 won't blow warm air until car is moving


Could try to change temperature sensor (due to MIL light), but it doesn't cause no heat in vehicle. Most likely caused by air-lock in heater hoses at heater core. Try bleeding hoses to eliminate air.

Dec 09, 2013 | Volkswagen Passat Cars & Trucks

1 Answer

If a trouble code on a 2000 vw shows speed sensor and the test comes out good what is the problem


engine speed sensor could be faulty.engine speed sensor provides the ECM with a crankshaft position signal.the ECM uses the signal to determine a crankshaft reference point top dead center and calculate engine speed. engine speed sensor like the crankshaft position sensor.if sensor faulty fuel system wont work. a bad engine coolant temperature sensor will cause engine shut off when hot.

Jul 28, 2013 | Cars & Trucks

1 Answer

I have a citi golf 1.4i is too difficult to start when is cold and it does not iddle what might be the problem, even when starting you need to press the accelerator also to boost it


May just need a good tuneup change fuel filter may help also... and maybe add a gas treatment to fuel tank......good luck.

Aug 15, 2012 | Cars & Trucks

1 Answer

Code 1 senser P0118 on a 2004 V.W beetle dicesel


P0118 for Volkswagen - (ECT) Engine Colant Temperature Circuit High

Symptoms:- Engine Light ON (or Service Engine Soon Warning Light)

Possible causes:
(Inspect the following... Repair/Replace if necessary)
- Low engine coolant level
- Engine Coolant Temperature (ECT) sensor harness is open or shorted
- Engine Coolant Temperature (ECT) sensor electrical circuit poor connection
- Faulty Engine Coolant Temperature (ECT) sensor
- Faulty engine coolant thermostat

P0118 VOLKSWAGEN Description: The Engine Coolant Temperature (ECT) sensor is used to detect the engine coolant temperature. The sensor modifies a voltage signal from the Engine Control Module (ECM). The modified signal returns to the (ECM) as the engine coolant temperature input. The sensor uses a thermistor which is sensitive to the change in temperature. The electrical resistance of the thermistor decreases as temperature increases.
When is the code detected?:When an excessively high voltage from the sensor is sent to ECM.

I hope this helps! Let me know if you need further assistance.

Mar 08, 2012 | Mercedes-Benz C Cars & Trucks

2 Answers

Obd code po183


Google bod code P0183 and this will tell you the answer

Oct 24, 2011 | 2005 Nissan Pathfinder

2 Answers

Hi, my 1982 vw diesel rabbit has a surage about 40 mph. Is this a air leak or seals weak?


Hi, surging generally means a fuel problem, and probably too lean.
A weak pump is one possibility, so you can check pressure with a gauge, another possibility is a sensor is bad.
There are air mass, air temperature, engine temperature, throttle position, oxygen, etc., sensors.
They can all be checked with an ohmmeter, and while methods vary, bad ones usually are 0 or infinite ohms. Air mass and oxygen sensors can get coated and need cleaning.

Jul 22, 2011 | Volkswagen Rabbit Cars & Trucks

1 Answer

In the morning or when my 1987 vw golf sits for a while (when the car is cold) it will start right up but then dies. i have to rev it and keep the rpm's up for a couple of minutes and as it get's warm it...


There are devices in the Bosch CIS-E system not functioning that may need replaced. Most commonly it would be the thermo-time switch. This switch is also a sensor telling the ECU whether your engine is cold or hot so it would compensate fuel delivery depending on temperature. An auxiliary air regulator also opens (more air) or closes (less air) dependent from the thermo-time switch signals. It's basically telling the ECU when it's a cold morning to supply a richer air/fuel mixture or not to when it's at operating temperature. There is also a cold start valve (fifth fuel injector) that could be sticking or leaking or simply not supplying fuel during cold start up. Again, this has a higher level of understanding and special VW tools to diagnose your fuel injection problem that should be left to a VW tech to work on. It could be dangerous because fuel is involved, a single spark from static electricity could ruin your day.

May 15, 2010 | 1987 Volkswagen Golf

3 Answers

Where is the temperature sending unit on a 1999 VW Passat located.


VW Passat & Audi A4 1990-2000

Motronic System
The Engine Coolant Temperature (ECT) sensor is mounted in the water outlet on the back side of the head. If you vehicle still has a original VW part it will be black in color with a four terminal connector. This device signals the engine management system with the current coolant temperature, the ECU takes this information and uses it to control other such circuits as the idle speed, knock control system, oxygen sensor circuit, exhaust gas recalculation, and fuel tank venting. It is also important to note that if at any time ECU does not receive a signal from the ECT it will substitute a value of 176°F (80°C).

VR6
The Engine Coolant Temperature sensor is mounted in the thermostat housing. The body of the sensor will be blue and the sensor will be blue and have two terminals if it is an original factory VW part.


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.On models produced prior to 1994, the engine coolant gauge temperature sensor is a single wire terminal sensor.

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.

WARNING When trouble shooting electrical components, always consult a wiring diagram for the particular year, make and model to ensure proper test equipment connection and diagnosis. Failure to use suitable test equipment and testing methods could permanently damage the electrical component(s).

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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


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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

I hope help you with this, good luck (remember rated this help).

Oct 13, 2009 | 1999 Volkswagen Passat

1 Answer

Fuel in the Oil Pan


Obviously for some reason it's dumping too much fuel. Did they erase codes after changing parts? Are they sure they put proper part on?
Could one of the new parts be faulty, yes. Have it scanned again & see what it turns up. By the way, I wouldn't go too far without changing that oil, & filter,then monitor the level every day for increase in level, indicating fuel in there again. Good way to ruin an engine, running it with gas in the oil.

Apr 26, 2009 | 1996 Volkswagen Golf

1 Answer

I have a 1999 vw diesel beetle-won't run when it is cold outside. 5th time back to vw dealer and over 3,ooo.oo dollars later and they now say a rodent made a nest around the electronic control module. New...


it could be some of the temperature sensors or something that is temperature dependant. what about maybe your fuel pump? it sounds like its maybe something that expands when it is cold and has difficulty to operate. this leads me to assume it could be the diesel pump. i hope this helps.

Mar 04, 2009 | 1999 Volkswagen Beetle

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