Temperature Sensor problem?

[h100vw]

Thanks Gav, any explanation for the temp gauge resetting to zero and then slowly moving back up to 90c everytime I turn the car on even once the cars warm?

Edit, I have made a video of what's happening too: Gti Polo Problem: Gti Polo Problem - YouTube

Any help is appreciated

Can't explain that.

[ForceFed]

Same thing happens with my Polo gti. After driving a while and turn the car off and turn it on shortly after temp is at zero and then goes back to normal after a few minutes of driving and I have a brand new temp sensor.

[louis19]

Can't explain that.

If you can't then no one will be able to haha!

Same thing happens with my Polo gti. After driving a while and turn the car off and turn it on shortly after temp is at zero and then goes back to normal after a few minutes of driving and I have a brand new temp sensor.

It's a weird one because you would think a new temp sensor would solve it with the mentality that the old one obviously is detecting temperature incorrectly when its restarted, thinking it's cold when it's really at 90c. However your not the first person who has replaced the CTS and had the problem continue.

Anyone else resolved the issue?

[rgvlee]

Tried to put an obd scanner on to see the temp reading as per the ecu? ECT is the obd code. To me that would rule out the temp sensor and push the issue back to the gauge itself.

[louis19]

Tried to put an obd scanner on to see the temp reading as per the ecu? ECT is the obd code. To me that would rule out the temp sensor and push the issue back to the gauge itself.

No, I haven't. Is this something beyond what a VAG scan can detect?

[h100vw]

No, I haven't. Is this something beyond what a VAG scan can detect?

No, VCDS would trump a generic scanner on VWs

[louis19]

No, VCDS would trump a generic scanner on VWs

Ok thanks Gav, hopefully when I catch up with you the scan gives an indication what's happening

[louis19]

Just wanted to check. Is this the location for the CTS?

[h100vw]

I don't think that's it mate. Is it in a plastic pipe? That looks more like the VVT to me.

Gavin

[louis19]

I don't think that's it mate. Is it in a plastic pipe? That looks more like the VVT to me.

Gavin

Yes, it is in a small plastic pipe. Do you know where I should be looking for the CTS?

I'm wondering if mine is intermittently not working as today it worked after being warm once turned back on, then at other times again returned to 0..

[louis19]

Update:

I replaced the coolant temp sensor on the weekend even though when Gav did a full scan on my car and tested the gauges to make sure everything was working correctly it all came back clear. It's really strange, if I turn the car off then back on straight away it will reset to 0 but if I come back after say a half hour or so, it will show the correct temperature. Anyone have any ideas? Starting to think it mist be an electrical problem somewhere along the line?

Any help appreciated!

[louis19]

Update:

I replaced the coolant temp sensor on the weekend even though when Gav did a full scan on my car and tested the gauges to make sure everything was working correctly it all came back clear. It's really strange, if I turn the car off then back on straight away it will reset to 0 but if I come back after say a half hour or so, it will show the correct temperature. Anyone have any ideas? Starting to think it mist be an electrical problem somewhere along the line?

Any help appreciated!

Anyone have any idea? Guessing it may need to go to an autoelectrition?

[Blue9N3]

Temperature Sensor problem?

Don't have any ideas but my car is just started doing this too. What's really puzzling is an obd2 scan says the temp is normal (90 degc) when the gauge is reading zero. Gauge returns to normal after a few mins of driving


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[nightphotographer]

Must be a common Polo GTI thing as mine has just started this a few weeks ago, doesn't sound to be quite as bad as above but it will sit at about 70 degrees permanently, doesn't take long to get there but even after 6 hours of driving it won't spend much time at 90. I was convinced it was the CTS, will see if VCDS picks anything up. It probably should bother me more than it should, but it's been like this for a few weeks now haha.