How many months/miles has someone had these knock sensors installed? Are they reliable?
1501486
Hey dude! I am a pretty car savvy guy and these are worth the $ had them for at least 6 months. They are Denso and original spec but are not off the same line or factory so are in a slightly different casing. I almost returned them but they have been working as expected and fit true. Good buy
1936602
Hey, I'm not sure about the warranty. But I would NOT recommend getting these. I bought 4 and 2 of them stop working in less than 1 month. And by that time, I would have to spend money to get the rims on and off the tire and buy 2 new sensors. By that time the warranty doesn't matter because you will have to spend more money just getting the rims on and off the tire to install the sensor than the price of the sensor itself. Sorry I can't answer your question, but just want to let you know it's not worth it.
2036343
It has been awhile but I am fairly certain that all 4 sensors are the same so should work just fine. After I installed mine, drove around and the check engine light went out on its own. Joe
2158017
i doubt anything about this machine is correct. It started making a knocking noise about a month in and i didn't have the cycles to get after it. That was about a year ago of course..Going hard for 15 minutes shows 1 mile and about 87 calories for what thats worth. Sure seems like more than a mile. Im guessing some internal sensor broke off and that may be part of it. It quit making that awful knocking sound which is part of why i never got after fixing it, but like i said, i doubt anything is accurate. Amazon put a hold on actually selling these things for a while. Too bad because it seemed like a good unit (in theory).. i doubt anything about this machine is correct. It started making a knocking noise about a month in and i didn't have the cycles to get after it. That was about a year ago of course..Going hard for 15 minutes shows 1 mile and about 87 calories for what thats worth. Sure seems like more than a mile. Im guessing some internal sensor broke off and that may be part of it. It quit making that awful knocking sound which is part of why i never got after fixing it, but like i said, i doubt anything is accurate. Amazon put a hold on actually selling these things for a while. Too bad because it... » Read More i doubt anything about this machine is correct. It started making a knocking noise about a month in and i didn't have the cycles to get after it. That was about a year ago of course..Going hard for 15 minutes shows 1 mile and about 87 calories for what thats worth. Sure seems like more than a mile. Im guessing some internal sensor broke off and that may be part of it. It quit making that awful knocking sound which is part of why i never got after fixing it, but like i said, i doubt anything is accurate. Amazon put a hold on actually selling these things for a while. Too bad because it seemed like a good unit (in theory).. « Show Less
1639986
http://www.clubfrontier.org/forums/f46/knock-sensor-relocation-how-41704/ This link will tell you everything you need to know
199171
I also have one sensor dead two years after purchase on Amazon (P409S Retrofit TPMS). I am considering getting another complete system since if one battery is gone, can the rest be far behind? Given the good performance of three systems in three of my vehicles I might spring for another complete system. Peace of mind is priceless.
316962
I put them in my step son's car so far they are I installed them in December 13 and no problems yet. He has been through a automatic carwash a couple of times that has under carriage jets also
512551
Just replaced them in vehicle. Factory Denso units lasted 92,000 miles. Yes I would use again vs cheaper units.
260188
They are an OEM replacement for your original sensors, without the BMW branding. I replaced both of my sensors on my 323i in April after having fault code P0133. (I can't remember which side that indicates is faulty, passenger maybe?) It's been running strong since.
1034405
I ended up doing both O2 sensors because it was cheaper. But less than a year later my rear cat converter is done and needs changing. I have 235,000 miles on though... I passed emission a month before the P0420 code came back, then it was my cat, so... I think the sensors were bad too... hope this helps!
1326206
Hi Jeffrey, I haven't had to replace mine yet. I still have the original ones I bought in May of 2013 (1.5 years), about 20k in miles on the car with about a 1/3 of them at night.
762465
I have 2... They last about 4-6 months it seems like, depending on how much activity they transmit. The sensor on your front door is going to use more power than a side door. Just my experience.
1048589
I haven't had any sensor problems with this kit and I installed it myself, its been about 2yrs with zero problems
41346
None at all. They have worked just fine. I had them installed in late October I believe.
1684381
Its a good question. I think the warranty is 90 days but I've never had an issue. They all come security sealed (white security strip on box) and factory tested. If the seal is intact, it will work. Here's what you need to know. You MUST know the installers code on your panel. If you had an dealer install the system they will have setup a special 4 digit code. I can't stress this enough. No dealer code, you can't change the system. If you don't know it, don't buy any of these sensors since you can't have the system learn any new sensors or make changes to existing ones. You're going to be stuck with them and not be able to use them. The code will be 4 numbers from 0000 to 9999. I'm with XXXXXX Security and I do know mine. I asked the tech to change mine and for some consideration he did. ONLY with the Dealer Code can you learn new sensors. You will also need the correct key pad. I dont know what panel you have but if its a GE Concord 4 you need the full Alpha Numeric Keypad, not the cheap smaller one. Dealers will usually install your own sensors but you'll pay a large install fee of about $150 to show up and $200 and hour. They will then charge you for service. Your best bet is to get the Dealer Code and install yourself. If you have a Concord 4 I can send you very easy instructions on how to do it. If its another panel, check online. Learning the process is easy. If you adding one or a few sensors, just pay your dealer. If your like me and added many new ones, I saved a fortune by getting the dealer code.
628000
I installed mine on March 29th and they're still buzzing, so they last four months +.
1687517
Pretty good. It probably depends on how often your doorbell rings. I change about twice per year.