TDI Temperature Sensor Faulty

Wheely

Full Member
Nov 19, 2003
176
0
The Sou' West
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Hi All,

GF's car (Leon TDI 110) just had biggy 60K service and when they plugged in vagcom, they found the temperature sensor was defective.

Now we had no symptoms of this - except I had previously moaned that mpg was a little poor, even after a maf clean and air-filter change.

So question is could this defective sensor play a part in the increased fuel useage ? (mechanic did say idle was a bit high, probs caused by this)

Sensor will be changed in a week or so.

Cheers

MARK
 

sssstew

Editing your spelling
yes it will,. the ECU changes the injection of fuel dependant on what it gets from the coolant sensor, the below text is from the VW tech doc for the TDI :-

Coolant temperature as determined by G62
To compensate for the longer firing delay when the engine is
cold, the injection cycle must be advanced.
The temperature signal corrects the map accordingly.
Substitute function
If the temperature sender fails, a fixed coolant temperature is
defaulted.
 

AwesomeSarah

Forum Sponsor
Mar 6, 2006
727
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Wow
Now that was an explination.
I would have just said yes.
I have also noticed that it does not always bring on warning lights or put up fault codes.
Common fault on VAG cars
Sarah
 
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