How JustAnswer Works:
  • Ask an Expert
    Experts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional Answer
    Via email, text message, or notification as you wait on our site.
    Ask follow up questions if you need to.
  • 100% Satisfaction Guarantee
    Rate the answer you receive.
Ask Adin3 Your Own Question
Adin3, Nissan Mechanic
Category: Nissan
Satisfied Customers: 3423
Experience:  Autozone Manager 3 years, mechanic 10 years
Type Your Nissan Question Here...
Adin3 is online now
A new question is answered every 9 seconds

2002 nissan xterra: service engine soon..The diagnostic codes..Knock

This answer was rated:

I have received a service engine soon light in my 2002 nissan xterra. The diagnostic codes read: Knock engine sensor and IAT sensor. Please advise how I shoul proceed.

Hello and thank you for choosing Just Answer.

Do you have the specific codes that you pulled from the diagnostic?

Customer: replied 8 years ago.
Yes: P0328 and P0127. I reset the codes they reappeared 80 miles later

Thank you. If you are getting the P0328 you should replace the knock sensor. I would hold off on the IAT, first change the knock sensor (common sensor that goes out) reset the codes and see if the p127 comes back.

Trouble Code: P0328 Knock Sensor Circuit High Input (Bank 1)

Possible Causes:

  • Knock sensor signal circuit is open
  • Knock sensor signal circuit is shorted to VREF or system power
  • Knock sensor is damaged or has failed
Adin3 and 3 other Nissan Specialists are ready to help you
Customer: replied 8 years ago.
To remove the knovk sensor the air intake manifold must be removed. Is there a way to test the knock sensor. The voltage from the sensor to the computer should be 2.4 volts. Is there a way to test at the computer. It should be a green wire entering the left side of the computer housing.

Actually that is the only way to test it manually.

  • Start engine and run at idle.

  • Measure voltage at ECM pin 64.

  • Voltage should be approximately 2.4 vDC.

  • The way we would measure it here at the shop is by doing a freeze data on the car.

    Related Nissan Questions