Engine coolant temperature sensor

[porlkertus]

Hi All,

My engine management light has come on and after reading the codes, i get P0118 for the engine coolant temperature sensor.

If i clear the fault I get trouble free motoring for a couple of weeks, but then the light comes back on. So i suppose its time to change the sensor.

The car is a 1.9 TDI 130 skoda superb.

Does anyone have the part number?
Are there instructions on how to change the part?

Thanks in advance!
Paul.

[AwesomeSarah]

Think you will find it may be same as the Octavia
Have a check as that is 4 pin green now
Part number 059 919 501A
The Fabia ones are different and hardly have any problems
So I am assuming it is the Octavia one
May be worth checking it out first
When the engine is cold of course
Sarah

[Supurbia]

I'm not 100% sure but I believe it's behind and under the egr valve.

[porlkertus]

Thanks for the replies!

After a search for the part number (from AwesomeSarah) and a few other related words on google, I found this page.

http://forums.vwvortex.com/zerothread?id=1287042

Looks like an easy job, although i have a diesel and this post was about a 1.8T petrol.

[Baker21]

Let us know how you get on..............pics would be good................

[porlkertus]

I have picked the part up from VAG Parts. When i have done the job i will post pictures

[porlkertus]

This is how I changed the engine coolant temperature sensor with help from a mate. This job needs a second pair of hands as you can’t reach for the new sensor and the tools you need whilst removing the old sensor. If you choose to do this yourself you do so at your own risk. Make sure the engine is cold!

The old sensor has part #078919501C, whilst the new sensor has part# 059919501A you are also best to get a new o ring and a new clip just in case. If your coolant is on minimum, you might want some more of that too.

1. Remove engine covers
2. Remove under tray - both parts
3. Unclip large hose to allow room to work
4. Remove electrical connector from sensor using flathead screwdriver – best done from underneath
5. Remove sensor retaining clip - best done from underneath
6. Remove old sensor and quickly put your finger in the hole to stop coolant leaking – best done from above
7. Remove the finger bringing with it the old ‘o’ ring quickly place another finger in the hole to prevent further coolant leaking – best done from above
8. Remove finger and quickly place new sensor (fitted with new ‘o’ ring) into place – you will lose a bit more coolant – best done from above
9. Fit the new clip
10. Re fit the wiring to the new sensor
11. Refit large hose, engine covers and under tray – job done

Here is an image of the engine bay from the offside, the sensor is circled in red



Here is a close up photo of the sensor



The car now runs better, I am getting a higher mpg - maybe the engine was running rich with a dud sensor?

Much thanks to my mate for all his help

Any questions please ask away.

[Baker21]

Good work mate, glad you got this sorted...........

[AwesomeSarah]

Nice one
Glad you got it sorted
Yes as the old sensor is worn , it can think that the engine is cold when in fact it is hot , so therefore it has if you like the choke on , which can flood it a bit much
Nice you got your economy back
Good pics and write up too
Sarah

[porlkertus]

Thanks for the replies.

A couple of days on and I realise how nice it is to be free of the ECU light and a funny message that kept coming up on the maxidot "Emissions Workshop!" I guess that was due to running rich for extended periods of time.

Have a good weekend

[bill362]

Hi there thanks for this post and the details of the cure as I am looking at a similar problem.
the fault code is slightly different P1256 -35 -10 Intermittent
Engine Coolant Temp Sensor (G62) open or short to Plus
but the root cause is clearly the same - time to see my local independent - thanks once again