Question about 2003 Jaguar S-Type

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Engine temperature coolant sensor

I have a 2003 Jaguar S Type. My check engine light came on and called for replacing the Engine coolant temperature sensor. I replaced the sensor but the check engine light has come back on. The car performs normally in city driving but when the car is taken on the highway at higher speeds the temperature gauge drops all the way down to cold and the restricted engine performance light comes on. The temp gauge appears to work normally when driven at lower speeds in the city but when driven at higher highway speeds the problems arise. Could there be another issue to this problem besides the sensor. The sensor that I put in was bought brand new from the dealership.

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  • Jaguar Master
  • 3,622 Answers

Your description indicates the engine/coolant thermostat is faulty and allowing at least some coolant to continue circulating so at higher road speeds the engine is over cooled.

Posted on Apr 03, 2017

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6 Suggested Answers

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Posted on Jan 02, 2017

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SOURCE: Jaguar s-type restricted performance displayed

Its most likely the coils and spark plugs, sometimes caused by oil leaking from the valve cover gasket. The coils deteriorate over time from engine heat and need to be replaced at 90-100k
Local garages don't have the Jaguar diagnostics terminal and are unable to do more than find basic error codes with a reader. Its important to get this fixed because it's causing damage to your caltalytic converters. They are expensive.

Posted on Jun 28, 2009

pippall
  • 1486 Answers

SOURCE: Engine Light on and Restricted performance message

Replace the mass air flow meter.

Posted on Jul 10, 2009

  • 295 Answers

SOURCE: 1999 Jaguar. Gearbox fault Restricted Performance

I would make sure the fluid maintenance is done. The most likely cause is the transmission or transfer case is gone internally.
I would take the vehicle to the transmission shop.

Good Luck

Posted on Aug 14, 2009

michigan man
  • 3533 Answers

SOURCE: cylinder 8 misfire, restricted performance is also coming on

you may have to replace the cowl pack itself that sit on top of the spark plug and sometimes you can get by just changing the boot wish you the best of luck Michigan Man.

Posted on Dec 06, 2009

  • 1 Answer

SOURCE: jaguar s-type restricted performance

I had the same problem. Restricted performance and running rough at 3000 RPM. I have an OBDII code reader and found that the problem was in the air mass flow sensor, which is just after the air filter. I pulled this out and found it was dirty and had butterfly wings in it. The last shop where I had the oil changed replaced the filter for me but put in the wrong size. Close but no cigar. Bought some *** Flow Sensor cleaner at auto store and fixed the problem. Get an OBDII reader with the ability to erase the codes. Comes in real handy.

Posted on Mar 01, 2010

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I need to replace, a ects in my 2003 KIA sedona where is that piece located


Sarah, The Engine Coolant Temperature Sensor on your Kia is located below rad hose driver side by exhaust manifold. May be a good time to flush coolant system when changing sensor.
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Coolant sensor


Jeff, you haven't said what the problem is or what vehicle you have.

However, be aware that some vehicles have two coolant sensors.

One sensor sends a signal to the ECU to help control the running of the engine. The other sensor sends a signal to the temperature gauge on your dashboard - it shows you what temperature the engine is at - i.e cold, normal or hot.

If your vehicle has two coolant sensors, failure of the first type would more than likely illuminate an engine check light.

Failure of the second type would cause the dash temperature gauge to permanently read cold or hot, irrespective of the true engine temperature.

To locate this second type of sensor, look in the area of the thermostat housing. It screws into the engine block and will have 1 or 2 wires connected to it.

The link below shows generic images of this second type of sensor:

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Apr 18, 2016 | Cars & Trucks

1 Answer

2003 s type jaguar engine coolant


If the coolant isn't low you most likely have a defective coolant level sensor.

Sep 12, 2012 | 2003 Jaguar S-Type

1 Answer

The coolant temperature guage will read 1/2 or 3/4 whent he engine is cold. The engine has a new thermostat and engine coolant temperature sensor. The scan tool reading is normal.


I would change all the coolant just to be safe sometimes the coolant gets all thick and greasy if not replaced very often and mabe check the pressure of the radiator cap sometimes if it was hit wrong it holds in too much pressure this once happened to me

Apr 14, 2011 | 2004 Jaguar X-Type

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Hi I own a 2003 Cadillac CTS I am getting a check engine light error light with code P0128 and my heat is fluxuating up and down I have already installed a themostat. What are my options


A code P0128 may mean that one or more of the following has happened:

1-Low engine coolant level
2-Leaking or stuck open thermostat
3-Faulty cooling fan (running too much)
4-Faulty coolant temperature (ECT) sensor
5-Faulty intake air temperature (IAT) sensor

Check coolant level
Check to make sure thermostat is functioning properly Check the Cooling fan Check the ECT sensor Check the IAT sensor If all else fails replace the thermostat

Jan 05, 2011 | 2003 Cadillac CTS

2 Answers

Check engine light is on says its the coolant sensor I have replaced it twice and light come back on and car stalls at 3000 rpm.


There are several codes for the sensor. I would need the exact code to help you. Are you getting 'insufficient temperature for closed loop operation?'

Dec 05, 2010 | 2003 Jaguar X-Type

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 Autozone.com:

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:
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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

Trouble locating cooling sensor on 2003 gmc envoy


4.2L Engine To Remove:
  1. Disconnect the negative battery cable from the battery.
  2. Drain the coolant from the engine.
  3. Disconnect the engine coolant temperature (ECT) sensor connector. Engine coolant temperature sensor removal and installation gm-04-42-1509.gif

  4. Remove the engine coolant temperature (ECT) sensor from the engine.
To Install:
  1. Apply thread sealer P/N 12346004 or equivalent to the engine coolant temperature (ECT) sensor threads.
  2. Install the engine coolant temperature (ECT) sensor into the engine. Torque the sensor to 12 ft-lb (16 Nm).
  3. Connect the engine coolant temperature (ECT) sensor connector.
  4. Refill the engine with coolant.
  5. Connect the negative battery cable to the battery.
5.3L & 6.0L Engines To Remove:
  1. Drain the coolant from the engine.
  2. Disconnect the engine coolant temperature (ECT) sensor connector. Engine coolant temperature sensor removal and installation removeect.gif

  3. Remove the engine coolant temperature (ECT) sensor from the left cylinder head.
To Install:
  1. Apply thread sealer P/N 12346004 or equivalent to the engine coolant temperature (ECT) sensor threads.
  2. Install the engine coolant temperature (ECT) sensor into the left cylinder head. Torque the sensor to 15 ft-lb (20 Nm).
  3. Connect the engine coolant temperature (ECT) sensor connector.
  4. Refill the engine with coolant.

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my manual says fuel fail 14 deals with yourr coolant temperature sensor is no in operating range

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