my GP keeps spitting up Water Temperature Sensor in the engine management. The car struggles to start when cold, which others on the forum have said replace the map sensor, but that never appears in the system. Its had two temp sensors in the last couple of months. One message on the diagnostic computer said intermitant fault and the new sensor displays the message plausability. Just wondering if anybody new what that meant and is there any fix
Technical Water Temp Sensor
- Thread starter gribbo91
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Technical Water Temp Sensor
m3chan1c
New member
It sounds like a sensor when the error is P0106 . This sensor is the one before the Intake throttle body (just in front of you fitted on the black metal tube).
However you might try reflash at the dealership maybe there is an update if its a common problem.
However you might try reflash at the dealership maybe there is an update if its a common problem.
Its a 0115 code which is water temperature sensor, will be trying a map sensor end of the week and maybe refit the old sensor which gave a slighty better reading than the newest one. If all else fails, I'll get an auto electrician out to check wiring
D4nny8oy
Established member
Guaranteed to be air temp sensor.
The air temp sensor usually fails and gives an air temp reading of over 45 deg. When starting from cold, the ECU sees the high air temp, also sees the low coolant temp, calculates the two cannot both be correct, and (wrongly) decides the coolant temp sensor is the faulty one (hence the "plausibility" error).
The air temp sensor usually fails and gives an air temp reading of over 45 deg. When starting from cold, the ECU sees the high air temp, also sees the low coolant temp, calculates the two cannot both be correct, and (wrongly) decides the coolant temp sensor is the faulty one (hence the "plausibility" error).
D4nny8oy
Established member
Yes. Had the issue on numerous Grande 1.2/1.4 8v's. If you can read the live ECU data you'll see the readings from the air temp sensor are wrong while the coolant temp is reading right.
D4nny8oy
Established member
ECU self-diagnosis is never always right. There's loads of cases where it'll assign the fault to the wrong component, and is the major downfall in many mechanics (including Main Dealers) who don't follow the diagnosis path, and instead rely fully on the machine telling them what's wrong.