martinfuchs1
Fiat 500 Knock Sensor Faulty Connection
Summary of the thread
A 2012 Fiat 500 owner experienced a check engine light, higher fuel consumption, and uneven idling, with diagnostics indicating a defective knock sensor. The suspected cause was a faulty cable or plug connection. It was suggested to inspect the wiring for damage or loose connections and use a multimeter to test continuity and voltage. The issue was resolved by a workshop, confirming a faulty connection, and the repair turned off the malfunction indicator.
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4 comment(s)
martinfuchs1 (community.author)
Besides visual inspection, is there a way to test the cable or plug connection? Is a multimeter suitable, or is specialized equipment necessary?
eberhardlehmann16
Yes, a multimeter is suitable to check for continuity in the cable and voltage at the plug. However, if you're not comfortable with electrical testing, it might be best to have a workshop diagnose it properly to avoid further complications. They have the right equipment.
martinfuchs1 (community.author)
Thank you for the advice. I followed your suggestion and had a workshop inspect the sensor and wiring. It was indeed a faulty connection, and the repair cost 95€. The malfunction indicator is now off.
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FIAT
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500
eberhardlehmann16
A defective knock sensor can indeed cause those symptoms. Have you checked the sensor's wiring for any obvious damage or loose connections? Sometimes it's a simple fix.