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 Victor Your Own Question
Victor, Toyota Master Technician
Category: Toyota
Satisfied Customers: 767
Experience:  Toyota Master ASE Certified, Prius/ Highlander/ Camry Hybrid Certified, trained in all areas
Type Your Toyota Question Here...
Victor is online now
A new question is answered every 9 seconds

I changed my air/fuel ratio sensor in my 2001 4-runner V-6..adjustment

This answer was rated:

I changed my air/fuel ratio sensor in my 2001 4-runner V-6 and now it is running a little rough, do I need to drive it or is there an adjustment I need to make?

HiCustomerand welcome to JustAnswer,


You can try disconnecting the NEG. terminal of the battery to see if that will reset the ECU's memory. There's no other additional adjustments or resets. If that still does not take care of the rough running problem, then you may have another issue here. To properly diagnose this, you need to find out what is causing the running rough issue. What I would suggest to do here is access a scantool to hookup to the vehicle and read the live data it's providing to the engine's ECU. By doing this, you can see what each engine sensor is doing and the values produced. This will be the most accurate way to find out what the engine is doing. Most independant garages have these scantools and all Toyota dealers have them.


Let me know if you need additional help.



Victor and 4 other Toyota Specialists are ready to help you
Customer: replied 8 years ago.



I did just that disconectted the negative, lights are still gone and engine seems to be running better, going out for a test drive.

Alright, let me know what happens.