richardmoeller37

Crown Victoria Knock Sensor Issue

My 2004 Ford Crown Victoria with a gasoline engine has the malfunction indicator lamp on. I found out the knock sensor is defective. I'm also getting increased fuel consumption and uneven idling. The cable or plug connection looks like it might be bad. Has anyone else had this?

A 2004 Ford Crown Victoria is experiencing a malfunction indicator lamp, increased fuel consumption, and uneven idling, suspected to be due to a defective knock sensor. The issue might be related to a faulty sensor or a bad cable or plug connection. It is suggested to check the sensor's resistance with a multimeter, but if uncertain, taking the car to a trusted workshop is recommended for accurate diagnosis and repair.

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4 comment(s)

That sounds familiar! I had almost the exact same symptoms with my old Opel Astra. Check engine light, rough idling, and my gas mileage went down the drain. Turned out to be a faulty knock sensor. In my case, the sensor itself was the problem. Did you check the sensor's resistance?

Thanks. I haven't measured the resistance yet. Can I do this with a conventional multimeter, and what's a normal range for this sensor?

Yes, a multimeter will do the trick. But honestly, messing with the resistance values can be tricky and not 100% conclusive. Given the symptoms and your initial cable check, and if you're not super confident with electrical testing, I'd say take it to a trusted workshop. It cost me around 95€ to get mine sorted.

I appreciate the advice. Based on the symptoms, I've decided to bring it to a shop. Thanks for confirming my suspicion, I will post the diagnosis and repair outcome.

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FORD

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CROWNVICTORIA