How do I change to farinheight temperature? - Cars & Trucks

Question edited for clarity and written English 'sense' to 'since', 'don't' to 'doesn't' etc.

Your coolant temperature sensor has likely failed if 'changed it' was the coolant temperature sensor and not the gauge. The scan tool gets the data from a few places as vehicles have more than one temperature sensor. The one on the radiator is the one that normally tells the ECM that the fan needs to run, but there is often another near the thermostat.

'year make model' as the first three words in every question please and placed in the correct 'make year model' category helps us to help you better. Every fault you could possible have can be found using Google 'year make model' (the problem)'.

https://www.google.com/search?q=2005+honda+civic+temperature+gauge+not+working

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check out this link.

https://www.youcanic.com/wiki/volkswagen-temperature-light-flashing-red

More here

https://www.google.com/search?q=1998+Volkswagen+Beetle.+The+temperature+light+flashes+red+when+car+is+cold

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you have probably been misinformed. The needle on the temperature gauge is controlled by the temperature SENDER unit ( not the temperature SENSOR unit) The sender unit is a single wire unit that is a resistance unit affected by heat of the coolant, The hotter the coolant the less resistance the higher the reading
The temperature sensor unit is a 2 wire unit that tells the ECM when to switch on the fan, when to go into limp mode if overheating and when to adjust the air/fuel mixture as the coolant warms up

Your temperature control module is shorting out causing the variations. Or the temperature door module is bad. The easiest to change out is probably the temperature control module, it is the unit you can see in the dash that permits you to change the temperature.

found this

Read more: How to Change Ford Focus Temperature Display to Celsius ' eHow.com http://www.ehow.com/how_5989096_change-focus-temperature-display-celsius.html#ixzz2Nd8mOf00

Scroll through the digital display used to display trip distance, until it displays the outdoor air temperature.
Read more: How to Change Ford Focus Temperature Display to Celsius ' eHow.com http://www.ehow.com/how_5989096_change-focus-temperature-display-celsius.html#ixzz2Nd8mOf00

Codes don't have a certain location, a code means a problem has occurred in a system of the electronics of the cars fuel control or emission control system.
P1401 NISSAN - EGR Temperature SensorPossible causes- EGR Temperature Sensor harness is open or shorted
- EGR Temperature Sensor circuit poor electrical connection
- Faulty EGR Temperature Sensor
- Malfunction of EGR function, EGRC-BPT valve or EGRC-solenoid valve
- Blocked EGR passages When is the code detected?An excessively low voltage from the Exhaust Gas Recirculation (EGR) temperature sensor is sent to Engine Control Module (ECM) even when engine coolant temperature is low, or an excessively high voltage from the EGR temperature sensor is sent to ECM even when engine coolant temperature is high.
P1401 NISSAN Description The Exhaust Gas Recirculation (EGR) temperature sensor detects temperature changes in the EGR passage way. When the EGR valve opens, hot exhaust gases flow, and the temperature in the passage way changes. The EGR temperature sensor is a thermistor that modifies a voltage signal sent from the Engine Control Module (ECM). This modified signal then returns to the ECM as an input signal. As the temperature increases, EGR temperature sensor resistance decreases.
This sensor is not used to control the engine system. It is used only for the on board diagnosis

A variety of sensors provide information to the ECM/PCM regarding engine operating characteristics. These sensors and their functions are described below. Be sure to take note that not every sensor described is used with every engine application. Coolant Temperature (ECT) The Engine Coolant Temperature Sensor (ECT) is a thermister (a resistor which changes value based on temperature) mounted on the engine coolant stream. As the temperature of the engine coolant changes, the resistance of the coolant sensor changes. Low coolant temperature produces a high resistance (100,000 ohms at 40°C/40°F), while high temperature causes low resistance (70 ohms at 130°C/266°F). The ECM/PCM supplies a 5 volt signal to the coolant sensor and measures the voltage that returns. By measuring the voltage change, the ECM/PCM determines the engine coolant temperature. The voltage will be high when the engine is cold and low when the engine is hot. This information is used to control fuel management, IAC, spark timing, EGR, canister purge and other engine operating conditions. A failure in the coolant sensor circuit should either set a Code 14 or 15. These codes indicate a failure in the coolant temperature sensor circuit.
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It looks like the above, under hood, passenger side, upper engine area, mounted in front side of water outlet (according to Autozone.com).

did you changed the themostat ? sound like you have a bad themostat. good luck.

look for vacuum leak at air filter to throttle body ..all along the snorkel use carb cleaner while running and waft areas described til motor changes personalitly