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Old 29-05-18, 06:50 AM   #1
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Default [SOLVED] Engine temperature too high - STOP warning on dash - but engine is cold

My Daughters 207 2009 has been running perfectly until yesterday, when starting it at the shops after only a 3Km run, the Temperature Gauge moved immediately to the top, the STOP warning appeared with the beeping.
The car was only mildly warm.

Left the car standing for around 5 hours and started it again, exactly the same result. I drove it home as it was only 500 meters away and left it standing overnight.

Same thing this morning. Within 3-5 seconds of starting the car, the needle jumps to the top and the STOP warning appears with the beeping.

There are no issues with coolant, oil, or any other similar thing.

The water pump was replaced about 7 months ago and the temperature sensor housing was replaced about 3 months ago as it started leaking fluid.

Now having done a bunch of reading here and elsewhere, I removed the Temperature sensor that sits inside the temperature sensor housing.

I placed that in some hot water with a multimeter attached and it seems to be working fine. Reinstalled it however I see the same problem.

Clearly it is not an overheating issue but some sort of electrical fault.

Is that the only sensor that could be causing this issue ? Does this mean it is likely to be an ECU fault meaning that is a heck of a big expense to fix ?

Any thoughts / suggestions would be much appreciated.

cheers
(Australia)

Last edited by Krammig; 01-07-18 at 05:50 AM.
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Old 29-05-18, 08:15 AM   #2
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Your temp sensor has failed due to water ingress replace it but check the wiring for signs of water ingress well known issue you say you tested it but it could still be sending the wrong readings back normally coolant fan comes on too.
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Old 29-05-18, 01:43 PM   #3
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You will also need to get fault code in BSI cleared or the fault will still be present when sensor is changed
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Old 30-05-18, 03:11 AM   #4
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Thank you both for the swift feedback.

Ok I will replace the sensor as suggested.

As to checking the cabling, is that just a "by sight" thing, just looking to see if there is water/fluid in the cabling loom/cover ?
Or is there something more specific I should be looking for ?

Thanks also for the comment on Resetting, it did not occur to me that I would have to do that. I have an OBD-II here.

cheers
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Old 30-05-18, 10:45 AM   #5
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as for checking, i remove a battery lead first, then you have 3 main plugs on the ecu and fusebox. Press tab and swing the arm back on each to release.

you are then looking for any water or signs of green corrosion.

try and bung hole or be fast when removing sensor to save loosing much coolant.

note any bleed valves stat/bulkhead and use these to bleed after, i get engine warm and give pipes a squeese.

obd should be ok to reset but note some codes need pp2000 etc
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Old 01-06-18, 11:20 AM   #6
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Updating you on the current situation ....

I purchased a new Sensor and installed it. Unfortunately I still see the exact same issue.

Would it be reasonable to assume the problem then is the ECU ?

thanks
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Old 01-06-18, 01:26 PM   #7
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Quote:
Originally Posted by Krammig View Post
I purchased a new Sensor and installed it. Unfortunately I still see the exact same issue.

Would it be reasonable to assume the problem then is the ECU ?
Could be the wiring inbetween...
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Old 01-06-18, 04:12 PM   #8
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long thread but a reset was needed with peugeot software Some help from the gurus plz :-) - Peugeot Forums
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Old 03-06-18, 01:50 PM   #9
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Thanks again for the replies.

Regarding clearing of codes / resetting, I have an ELM327 OBD2 ODBII Bluetooth device that has a number of mobile apps available from the Android/Google Play store.

Will this do the job, or do I need something like a PP2000 Lexia 3 ?

thanks
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Old 03-06-18, 06:07 PM   #10
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Planet/lexia needed
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