Check engine light on in my 97 Maxima. Knock Sensor?

Autozone ran a diagnostic and 2 of the 3 problems came up as knock sensor issues. The third was an emissions problem that the guy said was insignifigant. He recommended putting a pint of Sea Foam in my next tank of gas, which I did, but did not solve the problem. I do not know much about cars. Does this mean that the knock sensor needs to be replaced, or that the sensor is identifying a problem in the engine? Also, I just noticed the other day that there is a sticker by the gas cap that recommends using premium fuel. I have been using regular. Could this be part of the problem? Is premium fuel really necessary for this "not-so-high" performance engine? Thanks in advance for any advice.

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  • 1 decade ago
    Best Answer

    YOU MUST use premium fuel. Well... not really must, but yes it could definitely be part of your problem. When you use low grade fuel it forces your knock sensor to work overtime. You get spark knock and this, over time can be damaging. The Maxima's "VQ30DE" engine is a performance engine. It's the same engine that goes into the 300Z sports car. That's why your Maxima is so fun to drive! Premium fuel is reccomended my Nissan (see owner's manual)

    If treating your car properly, and buying premium fuel doesn't work see the below on the CEL:

    Get the exact error code from AutoZone, or I would reccomend pulling the Check Engine Light (CEL) code yourself.

    Once you get the code you can get knowledgable of what is actually wrong with the car (See CEL DIY and Codes Explained).

    You don't need to replace the Knock Sensor, but it will help improve performance and gas mileage if you do. If you want to replace it, the knock sensor can be replaced by yourself (see below link to writeup). They cost about $110 depending on where you get it.

    Source(s): Affect of Low Octane: http://forums.maxima.org/showthread.php?threadid=8... CEL DIY and Codes Explained: http://forums.maxima.org/showthread.php?t=104931 Knock Sensor Replacement writeup: http://www.motorvate.ca/mvp.php/507
  • Anonymous
    4 years ago

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    RE:

    Check engine light on in my 97 Maxima. Knock Sensor?

    Autozone ran a diagnostic and 2 of the 3 problems came up as knock sensor issues. The third was an emissions problem that the guy said was insignifigant. He recommended putting a pint of Sea Foam in my next tank of gas, which I did, but did not solve the problem. I do not know much about cars. Does...

    Source(s): check engine light 97 maxima knock sensor: https://biturl.im/BGXYf
  • Anonymous
    1 decade ago

    Maxima's have always had very high strung engines when it comes to maintanence and the type of fuel you use.

    Let's break this down for you.

    A knock sensor is one of the many sensors in your car that tell your ecu how the engine is running. It's a phonic sensor that picks up irregular sounds that can be harmful to your engine.

    Low octane gas in your car will cause your car to knock and can even cause catostrophic engine damage, which I've seen more than once.

    My first assumption would be that the gas you're putting into your car would cause your engine to detonate(alarm the knock sensor), however, that would bring up several different trouble codes(check engine light).

    So if your ecu has stored knock sensor codes, I'd go ahead and check them out. Your mechanic may let the car idle and tap on them slightly to see if the engine idle is affected or not. Your car should stumble because tapping a knock sensor is simulating a badnoise(knock or detonation or ping) which will make your ecu go rich or retard timing(make it safe for that period).

    Source(s): Nissan technician
  • ortelt
    Lv 4
    3 years ago

    1997 Nissan Maxima Knock Sensor

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  • 4 years ago

    For the best answers, search on this site https://shorturl.im/aycJ5

    Nissan sells just the torque converter for $1,400 that way you buy the $1,900 transmission assembly. If the torque converter clutch inside the TQ has failed it causes metal to be worn off that metal cannot be completely cleaned out. So always replace the Radiator too the cooler gets metal in it. There are only a handful of transmission shops that can successfully rebuild the Nissan Transmissions. Or sell it quick the total for transmission replacement most often costs $3,500 then Motor and trans mounts? P0325 will not set a check engine light Knock sensor costs $180 + installation P0744 is an electrical malfunction or mechanical just not engaging have the wire tested to the torque converter lock up solenoid to the ECM So Good Luck

  • pauljr
    Lv 4
    3 years ago

    97 Maxima

  • 1 decade ago

    I also own a 97 maxima and i work for a infiniti dealer . knock sensors commonly go bad on this model.I would suggest that you take it to neither your nissan dealer or a shop that you trust and have them hook it up to there computer to be sure. as for the fuel "YES " it does take premium . the cheap gas does not have enough octane to keep the injectors clean therefore it will knock. have your shop do a injection clean while its there. GOOD LUCK!!

    Source(s): 20 YEARS IN THE BIZ!!
  • 1 decade ago

    i own a repair shop,and its not the fuel causing it to do this ,,the knock sensor will cause this,,id have it replaced and see if that don't help it a lot,,they will make an engine run really bad,, but using a lower grade of gas is not going to make that much difference in it good luck hope this help,s.happy new years.

    Source(s): been a certified mechanic for 36 yrs,
  • 1 decade ago

    If you need more information than what Dodge Man suggested, I would hit up http://forums.nicoclub.com

    They have a lot of useful information on the Maximas.

  • 3 years ago

    1

    Source(s): Teaching Children to Read http://emuy.info/ChildrenLearningReading/?3MG0
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