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 Posted: Thu Apr 30, 2020 9:56 am |
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Joined: Mar 01, 2020
Posts: 14
Trade Rating: 0
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Hi all,
Hoping for some help.
Plugged my 2002 1.4 into a obd2 scanner and its coming up with coolant sensor fault.
Am I correct in assuming this is the green sensor in the top of the thermostat housing? I spoke to a chap at my local Citroen garage and he said there should be a second sensor but I'm not entirely sure he was right because I cant find anything anywhere other than this green sensor.
so my two questions are, 1. will changing the sensor in the thermostat housing make the fault code go away and 2. if there is a second sensor, where is it?? because I'm stumped.
cheers in advance!
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Posted: Thu Apr 30, 2020 10:28 am |
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Joined: Nov 27, 2010
Posts: 11520
Trade Rating: +10
Location: What's it to you? ? ?
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Change that green sensor.
Older Peugeot / Citroen stuff used to have up to 3 different coolant temp sensors fitted.
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| Toyota C-HR GR Sport 2.0 Hybrid with JBL & Alcantara packs. | |
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Posted: Thu Apr 30, 2020 11:22 am |
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Joined: Mar 01, 2020
Posts: 14
Trade Rating: 0
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Thanks for the advise. that's great!
Sorry to sound like a complete novice but is there any negatives to not having the sensor replaced?
I haven't long brought the car and believe this may be a long standing issue 
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Posted: Thu Apr 30, 2020 9:28 pm |
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Joined: Jun 19, 2010
Posts: 1600
Trade Rating: +4
Location: South Bucks
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if it isn't working properly it will not warn you if overheating, and may not kick the cooling fan on, and it could make the ecu think it's not getting warm, in which case you will be burning extra fuel.
On mine it would warn me it was overheating .. when it wasn't near getting warm let alone hot!
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| Down to just the 1.4 HDi. Cayman Green 2.0i CC sold. | |
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Posted: Fri May 01, 2020 5:56 am |
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Joined: Nov 27, 2010
Posts: 11520
Trade Rating: +10
Location: What's it to you? ? ?
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These coolant sensors have to be really faulty to throw a fault code / put the diagnostic warning light in.
You can have issues starting the car or it using excess fuel when the sensor isnt working correctly.
The sensor is easily replaced when the cooling system is totally cold.
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| Toyota C-HR GR Sport 2.0 Hybrid with JBL & Alcantara packs. | |
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Posted: Fri May 01, 2020 8:54 am |
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Joined: Mar 01, 2020
Posts: 14
Trade Rating: 0
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Okay cool, thank you for the advise.
The whole thing is kinda odd because from what I can see the temperature gauge is "working correctly".
The temperature gauge goes up and down as it should and when I disconnect the sensor all together I get the stop light and the fan going like the clappers so in my mind its working correctly... but the fault code is confusing / troubling.
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Posted: Fri May 01, 2020 8:57 am |
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Joined: Mar 01, 2020
Posts: 14
Trade Rating: 0
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I suppose I should change it regardless and see if that clears the fault.
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Posted: Fri May 01, 2020 10:26 am |
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Joined: Jun 20, 2012
Posts: 1171
Trade Rating: +1
Location: West Country
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On a diesel the faulty sensor decreased MPG and the engine would judder in pulses, even when gauges show correct values.
Here's the related thread: www.206info.co.uk/Foru...tml#585120
There you can also find how sensor pins resistance measurements were off for the faulty one (your ones will likely differ as it's a petrol).
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Posted: Fri May 01, 2020 11:59 am |
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Joined: Mar 01, 2020
Posts: 14
Trade Rating: 0
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Cheers Sim,
I'll have a read.
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Posted: Mon May 04, 2020 4:46 pm |
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Joined: Mar 01, 2020
Posts: 14
Trade Rating: 0
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All sorted now gents. Thanks for the help!
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Posted: Thu May 07, 2020 4:15 pm |
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Joined: Jun 19, 2010
Posts: 1600
Trade Rating: +4
Location: South Bucks
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| Darbleberry wrote: |
| All sorted now gents. Thanks for the help! |
Useful to let the community know what you actually did ..
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| Down to just the 1.4 HDi. Cayman Green 2.0i CC sold. | |
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Posted: Tue May 12, 2020 6:33 pm |
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Joined: Mar 01, 2020
Posts: 14
Trade Rating: 0
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Hi all, apologies.
I replaced the green coolant sensor on the thermostat housing and now the code is gone.
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