 Show How does the knock sensor work?Every time the engine knock sensor notices a vibration, it sends a signal to the engine's computer, reporting how large it was. The engine's computer is programmed to expect a specified range of signals from the knock sensor. Most information from the knock sensor will be bumps in the road or closing the car door. However, when a vibration is large enough, the knock sensor signal will trigger the computer to alert the driver. This is a protective measure meant to prevent complete engine failure. What are the symptoms related to a bad knock sensor?When the knock sensor sends a warning signal to the vehicle's computer, the computer will usually reduce power output and illuminate the check engine light. Some vehicles will not restart until the problem has been fixed. » MORE: How to tell if you have a bad knock sensor Can I drive with a knock sensor problem?No. When the knock sensor sends a warning to the computer, it is always treated as if there is an internal engine failure. The vehicle should not be started or driven until the knock sensor is diagnosed as faulty, or the issue is repaired. How often do knock sensors need to be replaced?On most vehicles, the knock sensor is tough enough to last over 150,000 miles. Knock Sensor Replacement Cost Estimates The average cost for a Knock Sensor Replacement is between $330 and $373 but can vary from car to car. 1st, you don't have to go to Advance Auto to have them use an OBD reader, you just have to perform the Key Dance and your Jeep will read out the DTC's in the Odometer or EVIC. (Yes, there are reasons to use a better Scan Tool that will give you more info, BUT often the cheap tool the auto stores use doesn't read out any more info than doing the key dance and
looking up the code yourself). Hummer Recovery Team, Did you add SeaFoam to the gas tank or Spray it into the Throttle Body? If you get a CEL, and it was because of a minor temporary condition that did NOT come back, the computer will usually turn off the CEL afer a while. That is more likely, than the minor cleaning Sea Foam can do to the engine, to correct a malfunction. BUT, its always possible. I would look up a list of DTC's for your Year Jeep and confirm it is what the
cheap tool advance auto used said it is. The codes can vary from manufacturer to manufacturer as well as the description they program into the tool use can be generic and sometimes misleading. The Knock Sensor detects detonation or pre-ignition in the engine, (i.e. spark knock) if you suffer this, the PCM will retard ignition to stop it. So, from what you told us, is the code P0330 telling you that the Knock Sensor is bad? OR Its telling you the Knock Sensor detected detonation
or pre-ignition. It makes a big difference. Look up the code and read the description. Have you noticed strange poping sounds from the engine? Sounds like diesel engines, like popcorn popping? Sudden loss of power or just sound without a loss of power? That is detonation or pre-ignition. If there is nothing wrong with the engine, then bad gasoline can cause it, or using lower than recommended octane gasoline can cause it. If your egnine is malfunctioning, it can cause the
detonation or pre-ignition. A bad EGR, bad ignition, erroded spark plugs, lots of carbon build up in the combustion chamber, the engine running to hot (often from cooling system problems). Carry heavier than designed for loads, at part throttle at high air density and temperatures could cause a temporary condition that induce the detonation/pre-ignition. If you were towing above the recommended wheight in death valley in the summer, I'd tell you that why you got detonation/pre-ignition,
don't do it again and it won't get detonation/pre-ignition again. When was the last time you changed the spark plugs? When does the OM for your M/Y recommend to change them? Joined
Oct 19, 2011 · 2 Posts
Discussion Starter · #1 · Feb 1, 2013 I just swapped both knock sensors on my wife '07 Commander Limited with the 5.7L Hemi. I did some searches on this prior to doing it and didn't find much info on the location of the sensors, so I thought I'd right this up. I don't have any pictures but it is really easy. One sensor is located just below the exhaust manifold on both sides of
the engine. On the commander I just took off the plastic covering on the bottom after lifting the front of the Jeep on jackstands. There are four 13mm screws holding on the cover. The passenger side sensor is the easiest to see. There is a large gap between the radiator support and the suspension, and you will see a wiring harness that splits and goes to two sensors. The sensor more toward the front and top of the enigne is the knock sensor. It also is a 13mm bolt right through the middle of the
sensor. It was easy enough to get at with a ratchet and was finger loose as soon as it broke. The drivers side knock sensor is only slightly more difficult. It is in the same exact spot as the passenger side sensor only on the drivers side. However, the starter is right there as well as a metal line going into the oil pan. The starter ground wire(?) is in the way of getting to the sensor, but it is just a 10mm nut and comes off again with a small ratchet or wrench. Just move the wire out
of the way and it is now a clear shot, except for the metal line going right over the bolt for the sensor. A short 13mm wrench gets at it no problem and again comes out finger loose as soon as you get it broke. Installation is reverse but you will most likely be starting the bolt blind since the hole isn't large enough to get your eyes on it while doing it. Be patient and get a turn on it and then no problem whatsoever. The mechanic quoted me 2 hrs for this job. I had it done in about 45
min but I wasn't in a hurry (and I took a break for pizza and beer). I could go back and do this in about 15 now. P.S. sorry no pics, didn't think about it until after the job was done.
Joined Dec 31, 2005 · 1,256 Posts
Just curious why you changed them... Joined Jun 20, 2011 · 1,458 Posts
Never heard of a knock sensor issue. We could learn something from your experience. Joined Oct 19, 2011 · 2 Posts
Discussion Starter · #4 · Feb 2, 2013 I was getting DTC codes for bank 1 and 2 knock sensors (P0325 & P0330) and also catalytic converter (P0420). I changed the spark plugs thinking it could be a misfire issue, but did not do anything (still needed to be done though). I took it to meineke and they confirmed the codes and said bank 1 cat was bad as well as both sensors. I swapped the
sensors myself instead of paying them for 2hrs of work the night before having the cat installed. Update: took it out last night and CEL back on. Did the key dance and getting the P0420 code only, and not the sensor codes. Thinking it could be a faulty O2 sensor but just guessing. The new cat from meineke came with a two year warranty so if a new O2 sensor doesn't work than I will take it back to them. At least the knock sensor codes are not getting pulled anymore. What are the symptoms of a faulty knock sensor?FAULTY KNOCK SENSOR: SYMPTOMS
Engine warning light comes on. Error code is stored. Reduced engine power. Increased fuel consumption.
Can I drive with a faulty knock sensor?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.
Where are knock sensors usually located?Where is a Knock Sensor Located? A knock sensor is typically attached directly to the outside of the engine block, but in some cases, it is located underneath the intake manifold.
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2006 jeep commander knock sensor location
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