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Old 10-07-2019, 04:21 PM   #1
jacobe38
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Default p0117 advice and help please

my car over heats at idle only (not under load, even hard load)

the needle climbs rather suddenly after idling a bit and will throw a CEL for p0117 - engine coolant temp sensor circuit low input. the cel went away on its own but with it idling the needle starts to climb again and im sure the cel would return if i let it get hot enough.

fans work, coolant level is fine, no burping/hissing/overflowing. car otherwise runs fine. coolant/oil doesnt look mixed (so far)


where is this coolant temp sensor located on an ej255? i think that is my next move. but idk where it is.

car is 2013 impreza wrx thank you
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Old 10-08-2019, 10:08 AM   #2
viper_crazy
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Temp sensor is located on the coolant cross over pipe, basically behind the alternator. You'll have to remove the alternator to get to it, but it's a fairly easy job. You can drain a bit of coolant first to avoid losing coolant all over your engine. Of course, make sure you use a clean pan so you can reuse the coolant to top up again.

Side note, always use the turbo expansion tank to fill the cooling system.
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Old 10-08-2019, 11:30 AM   #3
jacobe38
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thank you viper_crazy!

where do i drain coolant from initially? from the cross over pipe?
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Old 10-08-2019, 12:15 PM   #4
hoang5659
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correct me if i am wrong but you can drain some from the radiator into a clean bucket so that you can reuse it when you are done replacing the sensor. just bring the level down far enough so that it wont come gushing out when you remove the sensor.
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Old 10-08-2019, 12:51 PM   #5
viper_crazy
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Quote:
Originally Posted by hoang5659 View Post
correct me if i am wrong but you can drain some from the radiator into a clean bucket so that you can reuse it when you are done replacing the sensor. just bring the level down far enough so that it wont come gushing out when you remove the sensor.
This ^.

There's a drain plug on the bottom of the radiator. It should be on the passenger side. You'll need a Philips screw driver, preferably a larger one.
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Old 10-08-2019, 01:17 PM   #6
jacobe38
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thanks!!
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Old 10-09-2019, 06:24 PM   #7
jacobe38
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any estimates on approximately how much coolant to drain before trying to pull the sensor?
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Old 10-10-2019, 02:00 PM   #8
viper_crazy
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I'd guess about 2 litres.
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Old 10-10-2019, 03:06 PM   #9
undyjr
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Do you really need to drain any coolant and risk having issues bleeding the system? If you depressurize the system and have the new sensor ready to swap I wouldn't see you losing much coolant at all, correct me if I'm wrong. Being an HVAC mechanic I replace sensors all the time "on the fly" in hydronic systems, you just have to depressurize the system.
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Old 10-10-2019, 10:02 PM   #10
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You could do that too. But there's gonna be a bit of air in the system either way.

If you fill the system properly to begin with, you shouldn't have issues with air or bleeding. I never have.

Remove both rad and turbo tank caps. Fill until the rad is full, you'll want to watch it until it's full so it doesn't overflow. Put rad cap back on. Continue filling turbo tank until full and put turbo tank cap on. Run engine until warm. Shut off engine. Fill overflow bottle to max line. Let engine cool and fill overflow bottle as needed.
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Old 10-11-2019, 12:54 PM   #11
jacobe38
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I've never burped or swapped coolant myself so thats why im checking on these things


i got the new sensor, it has a copper crush washer...any ideas on torque specs?
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