1999 VW New Beetle Coolant Temp Sensor

This may happen if the connector is disconnected from the sensor, or the sensor could be bad. The sensor is probably located in the thermostst housing at the engine outlet. Follow the top radiator hose to the outlet.

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:

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:

P0117 Engine Coolant Temp Sensor Circuit Low Input

ECM detects short circuit in wiring or engine coolant temp sensor (G62)

If it's a 2.0L, then the coolant sensor would be an easy fix. It's between the Air box / engine (on top of the coolant flange on the end of the head). If you do that, you probably should do a thermostat. Usually it's recommended to replace the thermostat when you do a coolant temp sensor, but that's up to you.

the coolant temp sensor is by far the most common fault.the only other thing it could be is the sensor in the coolant header tank.if you disconect the 2 pin sensor from where you top the coolant up and bridge out the 2 pins in the connector with a bit of wire.if this cures the fault you know its the coolant level sensor.if it persists and its straight from a cold start then the coolant temp sensor is the most likley cause.hope this helps.

YES & IT REALLY IS THAT EASY

Yes it is that easy. It should be a 4 pin connector located on the transmission side of the engine head in a plastic flange. Best is to wait for the engine to be cold. Unscew the radiator cap to relieve pressure but screw it right back on. On the 2.0L engines when you unclip the coolant sensor little or not coolant loss will happen if you do this. Just unplug it, pull out the clip, pull out the sensor, and the seal which sometimes stays stuck. Install the new sensor with a new seal lubricated with some coolant, make sure it's well seated and reinstall the clip. The sensor is well seated if the clip fits right over the top, just make sure both sides clipped into position. Replug it fill the coolant with VW original coolant mixed 50-50 with water if needed and done. If you have a fault you might need a scanner to erase the check engine or fault in the cluster.

What's the reason for changing it? Eratic temperature readings?

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here is a picture of where it's located on your jetta: