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Diesel heater light staying on longer

tomsimmons
in Skoda Octavia Mk1 (1996-2004)

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Evening all

I've noticed over the last month or 2 that the preheater light for the diesel seems to always take the full amount of time, even if the car has been only been off for a few minutes.

Initially I thought it was just because of the colder weather, so it was taking the full heat cycle, but not that the Girlfriend has a diesel Octavia too I've seen that hers is still variable, and less than mine.

Mine is starting fine 99% of the time, occasionally it fails seems to fail to catch, or only just catches, am I looking at the beginnings of the battery failing?

Tom

Duff coolant temp sensor?

What colour is the one in your car? Grey or green?

  • Author

Duff coolant temp sensor?

What colour is the one in your car? Grey or green?

No idea, I'll have a read of the Haynes to find it, then check.

How would a coolant sensor affect the diesel heater from a cold start?

It gets up to the 90°C running temp OK, though does seem to take a little while to get warm enough to clear the windows.

Tom

Edited by tomsimmons

The CTS tells the ECU what temp the coolant is at, and thus affects how the car starts. If the CTS is resporting it is extra extra cold, then the glowplugs might be engaged for longer. Can you stick vagcom on it and see what value it is reporting?

What is the cars performance like (acceleration & MPGs)?

  • Author

The CTS tells the ECU what temp the coolant is at, and thus affects how the car starts. If the CTS is resporting it is extra extra cold, then the glowplugs might be engaged for longer. Can you stick vagcom on it and see what value it is reporting?

What is the cars performance like (acceleration & MPGs)?

Ahh I see.

Vag Com should be here today - stroke of luck eh?

Acceleration seems OK, MPG maybe a little down.

The sensor I'm assuming is the one in the pipe along the right side of the engine, mounted at an angle into the pipe?

Tom

The sensor I'm assuming is the one in the pipe along the right side of the engine, mounted at an angle into the pipe?

cts_location.jpg

  • Author

And that little flash of green is what I'm looking for to confirm I have the green version?

Tom

Pass, I would imagine that is part of the plug rather than the sensor itself.... maybe a closer look with a mirror might help. Or just remove the clip and pull out the sensor, and have a quick look....

I found it much easier to pull the sensor, put a new one in (with a new o-ring) and then figure out how to disconnect the plug from the old sensor as it was rather difficult to do when in situ.

And that little flash of green is what I'm looking for to confirm I have the green version?

Tom

Yes!

  • Author

Erm, OK.....

I've just had a quick look, doesn't appear to have the same little opening where the green shows through, and it all appears to be black?!

Tom

you probably have the older grey version of the CTS then.

See if you get an error when you scan the car with VCDS.

Duff coolant temp sensor?

What colour is the one in your car? Grey or green?

Does it matter what colour is the sensor?What is the difference between gray and green sensor?

  • Author

Well I was hoping to get that today, sadly seems the post is on a go slow, so I guess it'll be tomorrow, or when ever they feel like it.

Tom

Does it matter what colour is the sensor?What is the difference between gray and green sensor?

The green is an uprated part, the original grey ones broke a lot so they were superseded by the improved green ones.

The green is an uprated part, the original grey ones broke a lot so they were superseded by the improved green ones.

Ok I just changed mine a week ago due to bad idle and the original was gray.I got the febi green one from Pages around £7 and it sorted the problem.Also I noticed that MPG has gone up.Funny thing is that the temp.gauge never played up as many people experienced when theirs went.

  • Author

Ok I just changed mine a week ago due to bad idle and the original was gray.I got the febi green one from Pages around £7 and it sorted the problem.Also I noticed that MPG has gone up.Funny thing is that the temp.gauge never played up as many people experienced when theirs went.

Pages?

Just looking on EuroCarParts, they want £16, TPS wanted £32...

Tom

Jorily sell the febi ones. Have a look at their website. Lots of people have been burned (not literally) by buying cheap "oem quality" ones from ebay. I would assume that Jorily can be trusted to dell oem quality ones though.

Ok I just changed mine a week ago due to bad idle and the original was gray.I got the febi green one from Pages around £7 and it sorted the problem.Also I noticed that MPG has gone up.Funny thing is that the temp.gauge never played up as many people experienced when theirs went.

That's because the sensor provides one output to the gauge, the other to the ecu. Sounds like your gauge output was ok but your output to your ecu was borked.

  • Author

OK, VAG-COM finally arrived, sortout out the usb/serial driver issue, scanned the car and...damn you guys are good!

17664 - ENgine Coolant Sensor (G62: Open or short to plus

Best I can get locally is £16, and not sure who makes it. eBay have a few Febi ones, about £11 ish, Jorily have it at the same.

The only thing I'm not sure of is whether the Jorily one comes with the O-ring? The eBay ones do, the one from the dealer doesn't. Can anyone confirm? (Jorily aren't answering at the blower at the moment)

Tom

  • Author

OK, VAG-COM finally arrived, sortout out the usb/serial driver issue, scanned the car and...damn you guys are good!

17664 - ENgine Coolant Sensor (G62: Open or short to plus

Best I can get locally is £16, and not sure who makes it. eBay have a few Febi ones, about £11 ish, Jorily have it at the same.

The only thing I'm not sure of is whether the Jorily one comes with the O-ring? The eBay ones do, the one from the dealer doesn't. Can anyone confirm? (Jorily aren't answering at the blower at the moment)

Tom

OK, they answer emails pretty quickly! It does come with the clip and o-ring.

If they've got a suitable air filter, they've got the business.

Tom

jorily sell genuine ones too i think

  • Author

Ordered a filter set (Skoda After Market apparently), a pollen filter and a new temperature sensor.

I'll slap the air filter and temp sensor in now, the fuel can wait until the oil is done later this year.

Then hopefully my glow pluglight will start doing what it should do, the error code will disappear and the MPG will be 100. OK so the last bit is a dream but hey.

Tom

  • 2 weeks later...
  • Author

Well I'm afraid I can't recommend Jorily.

I ordered last 7th March, and here we are on the 16th March still waiting for them!

Phoned on Monday gone (after a week) and asked, the reply was did you not see the note on the website - we're moving.

As far as I can make out the note is on the contacts page which you have no reason to view if you're just placing and order.

So £7 something for delivery and it's taken a week and a half (and not arrived yet)...think I'll be going else where in the future.

Tom

What a crap attitude. Since when did the fact that they chose to move become your problem?

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