paulmoon73
S80 Knock Sensor Connection Issue
Summary of the thread
A 2000 Volvo S80 is experiencing issues such as a check engine light, poor fuel economy, and an unstable idle, which are suspected to be related to the knock sensor. The problem may be due to a faulty connection or wiring to the knock sensor rather than the sensor itself. A similar case was resolved by fixing a corroded connector, suggesting that checking and repairing the connection could be an effective solution.
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4 comment(s)
paulmoon73 (community.author)
I visually inspected the harness and the plug looks okay-ish, but these things can be tricky. Was your issue definitely the connection then, or something more involved? Want to be prepared for the worst...
sarahjohnson5
Turns out it was just a faulty connection and I visited a car repair shop to have it fixed. If you’re not comfortable doing it yourself, I’d advise taking it to a reliable workshop. Cost me around 95€. Better safe than sorry!
paulmoon73 (community.author)
Thanks for the info! I appreciate the confirmation. It ended up being a corroded connector, exactly as you suspected. Quick fix at the shop and we are done :)
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VOLVO
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S80
sarahjohnson5
I had similar issues with my S80 – rough idle, check engine light, the works. It very well could be a bad connection to the knock sensor. Are you sure it is the sensor itself and not something else? Have you checked the wiring harness leading to it?