Question about 1999 Cadillac DeVille

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Where can i find the ect sensor on my 1999 cadillac deville

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where can i find the - zjlimited_1119.jpg

Fig. Showing the location of MAP Sensor and other components on the front of the engine: 1. Manifold Absolute Pressure (MAP) Sensor; 2. Idle Air Control (IAC) Valve; 3. Engine Coolant Temperature (ECT) Sensor; 4. Throttle Position (TP) Sensor



Fig. Engine coolant temperature sensor (1).

Posted on Apr 28, 2011

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1 Answer

Failed ect sensor thermostat reading over 270f


It means you should try replacing the engine coolant temperature sensor as it has probably failed (it's located on the driver's end of the engine at the middle about half way down).

Jan 25, 2018 | 1996 Cadillac DeVille

1 Answer

Location of cooling fan sending unit 1999 cadillac deville?


If you are refering to the Engine Coolant Temperature (ECT) sensor,it is located on the right rear of the engine below the exhaust gas recirculation (EGR) valve.

HINT: If your Deville is equipped with the analog instrument cluster and the temperature gauge is working, or if you have the digital instrument cluster and the driver information center (DIC) has been diplaying messages telling you that the engine is hot, the problem with your engine cooling fans is NOT the sensor.

Jun 02, 2012 | Cars & Trucks

1 Answer

Having trouble locating ect sensor 1999 deville, where is it


Back of the engine. #3 in the pic below. Has a 2-pin connector and a brass nut.
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Oct 09, 2011 | 1999 Cadillac DeVille

1 Answer

1999 cadillac sedan deville and it keeps showing temperature of 200 plus but car is running smooth!! this temp reading scares me what could be the cause!!


Some thing too check:

Make sure coolant level is up to line and clean (not dirty, may need to be flushed out).

Make sure air flow through the out side of radiator is clear (dirt, leaves, ect..) .

Make sure electric fan is working properly (not running slow).

Check radiator cap, (no gasket tears).

Could be thermostat going bad ?

Could be coolant temperature sensor/switch (from computer) going bad?

Check radiator hose(s) (too soft, may collapse)?

ECT.............Hope tis was some help??.


Jul 22, 2011 | 1999 Cadillac DeVille

1 Answer

Where is the ect(coolant) sensor located on a 02 cadillac deville???


The engine coolant temp sensor is located just below the throttle body.Just remove the air cleaner tube and you should be able to see it.There will be a black and a yellow wire on the connector.Hope this helps.Good luck.

Nov 06, 2010 | 2002 Cadillac Deville

1 Answer

The ect sensor went out trying to locate it


in the left rear corner of the engine, below the exhaust gas recirc valve..has two wires black and yellow

Sep 12, 2010 | 1999 Cadillac DeVille

2 Answers

P1258 CODE


Trouble Code: P1258 (4.6L V8 VIN 9 Auto)
Engine Metal Over-Temperature Protection
Number of Trips to Set Code: 1
OBD II Monitor Type: CCM Details
Indicators: MIL Details
Trouble Code Conditions:
DTC P0117, P0118 and P0125 not set, Engine started; and the PCM detected the ECT sensor indicated more than 270ºF for 10 seconds. The PCM uses the ECT sensor to detect if the engine is running too hot (when the ECT sensor is over 268ºF). If the engine is overheated, DTC P1258 will set. The PCM will disable 2 groups of four cylinders by turning off the fuel injectors. By switching between the two groups of cylinders, the PCM is able to reduce the temperature of the coolant and lower the temperature.

Possible Causes:
  • Engine cooling system problem (test the cooling fan operation)
  • Engine coolant level is low or the mixture is not correct
  • ECT sensor is out-of-calibration or "skewed"

Aug 13, 2010 | 1999 Cadillac DeVille

1 Answer

What is the easiest way to remove and replace the engine coolant temperature (ECT) sensor on a 99 Cadillac Deville, 4.6L


disconnect the negative battery cable.
Pull the harness of the sensor.
Drain about 1/4 of the radiator fluid.
Place a rag under the sensor and use a wrench to remove and replace the sensor.

Aug 12, 2010 | 1999 Cadillac DeVille

2 Answers

I have a code p452 does anybody know what this means... 1999 Cadillac deville


PO 452 FUEL TANK PRESSURE SENSOR CIRCUIT LOW INPUT CONDITIONS.YOUR FTP SENSOR IS DAMAGE OR HAS FAILED.

Sep 10, 2009 | 1999 Cadillac DeVille

1 Answer

Location of coolant temperature sensor


Maybe this will help . although this is from a 1997 Caddy.


Cadillac DeVille Engine Coolant Temperature (ECT) Sensor Location62451583.gif

Nov 20, 2008 | 2004 Cadillac CTS

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