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Why would a knock sensor fault code only come on when engine bays hot?

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Old 13 March 2012, 07:41 PM
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Martin 2010
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Default Why would a knock sensor fault code only come on when engine bays hot?

Hi guys basically when cars warmed up and sitting still or in traffic etc the light comes on, out on open road with plenty of cool air cooling engine bay the light stays off ? any one got ne ideas? when i say light i mean ECL
Old 13 March 2012, 08:37 PM
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ilogikal1
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Have you checked the connection to the sender? Mine had a dodgy connection and threw up the CEL at seemingly random times.
Old 13 March 2012, 08:46 PM
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Rob Day
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loose connection, broken wire or the sensor is failing would be my first guess.
Old 13 March 2012, 09:33 PM
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tjmatt
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I had very similar problems on a classic MY99. When I measured its impedance it was too high. I purchased a replacement non-oem sensor (supposedly identical, measured impedance was now correct) and ended up with similar problems. Returned it a while later and got a proper subaru sensor. This time it worked, and has never thrown the code. I'd recommend the proper Subaru replacement sensor, torqued to the correct value as I was having problems for ages with mine!
Old 13 March 2012, 09:59 PM
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Mrchips
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I'd replace it. Getting old so better safe then sorry
Old 13 March 2012, 10:18 PM
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Martin 2010
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Originally Posted by tjmatt
I had very similar problems on a classic MY99. When I measured its impedance it was too high. I purchased a replacement non-oem sensor (supposedly identical, measured impedance was now correct) and ended up with similar problems. Returned it a while later and got a proper subaru sensor. This time it worked, and has never thrown the code. I'd recommend the proper Subaru replacement sensor, torqued to the correct value as I was having problems for ages with mine!
ok mate nice one, where did you purchase your sensor from please? and do you know what they need to be torqued to? how hard are they to get at with out removing inlet manifold ?
Old 13 March 2012, 10:42 PM
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SLAB
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sounds like its cracked m8 have a few pm me if you need one
Old 13 March 2012, 10:43 PM
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ilogikal1
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Originally Posted by Martin 2010
ok mate nice one, where did you purchase your sensor from please? and do you know what they need to be torqued to? how hard are they to get at with out removing inlet manifold ?
IIRC it's easy enough to get to with the intercooler off, no need the remove the inlet.
Old 13 March 2012, 10:58 PM
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Martin 2010
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That's alright then as I'm running a fmic lol,
Old 07 April 2012, 01:48 PM
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davoid
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similar car and problem, me. Did you fix yours? if so, how?


thanks
dave
Old 07 April 2012, 05:13 PM
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Martin 2010
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i changed the knock sensor, then re set ecu by taking negative off the battery for 20 mins, and was fine after his mate.
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