Can I drive with a bad knock sensor? Technically, yes, but the real question is, should you?
Located on the cylinder head, intake manifold, or engine block, the knock sensor functions as an ear to your car’s computer, picking up unusual vibrations caused by engine detonation. Upon detecting these small internal tremors, the knock sensor sends a voltage signal to the powertain control module so it can adjust the ignition’s timing to stop the detonation.
By performing this task, the knock sensor ensures your engine operates properly and isn’t damaged as you drive.
When your knock sensor gets broken, your car will experience a dip in acceleration. Your emission production will also worsen as the engine may run hot. Overall, your car’s output will be compromised.
That said, it helps to know common bad knock sensor symptoms. As mentioned, if you feel the engine isn’t accelerating as smooth as before, there’s a good chance your knock sensor has already conked out. You can confirm this if driving at a certain speed feels off, especially if you’re hauling heavy load. When this happens, the Check Engine Light usually turns on—this is a signal you can’t miss.
Other indications include loud knocking sounds, reduced fuel economy, and a damaged engine. You wouldn’t want to wait for that last symptom because, well, we all know how horrific the repercussions of a busted engine are. Also, knock sensor cost is a price cheaper to pay than having your engine replaced.
In conclusion, you can drive with a bad knock sensor—that is, if you want to destroy your engine and get atrocious performance from your car. The moment you confirm that your knock sensor has seen better days, it would be wise to swap it right away with a high-quality replacement.
For knock sensor replacement options that will surely meet your car’s specifications (and your budget expectations too), go to CarParts.com. We have a wide selection for top-notch knock sensors coming from brands trusted in the industry.
You can shop on our online store at your convenience, either via your desktop, laptop, or smartphone. Search for your item in our easy-to-navigate interface—you can get more specific results if you enter your vehicle’s year, make, and model in our vehicle selector—place an order, and have the part delivered to you in no time.
You can check the knock sensors we offer here: https://bit.ly/3adk0Iu
Any information provided on this Website is for informational purposes only and is not intended to replace consultation with a professional mechanic. The accuracy and timeliness of the information may change from the time of publication.
BS, I have a front and rear knock sensor. rear went bad 50K miles ago. I now have 282,000 miles on the truck and don’t notice one difference
Hi Keith,
The side effects of a bad knock sensor will depend largely on the year, make, and model of your vehicle. On all vehicles built after 1996, a bad knock sensor will almost always turn on the check engine light, which will result in a failed emissions inspection (if you live somewhere that requires such an inspection).