O2 Sensor - JeepForum.com
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post #1 of 3 Old 07-06-2013, 01:22 PM Thread Starter
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Join Date: May 2013
Location: Prescott
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O2 Sensor

1990 Jeep YJ 2.5L, EFI
I've been fighting engine knock and have finally changed out the O2 sensor.
The knock quieted a lot but the engine was pretty rough running.
Question, do I need to reset anything with the O2 change? I looked for a fuse for the sensor and could not find one.
Also, I've never had any trouble with my battery and after the first ride with the new sensor I could not restart due to low battery. It's seems to be taking a charge now. Will know in a couple hours.
Thanks in advance for any help give.

Odie4az is offline  
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post #2 of 3 Old 07-06-2013, 11:05 PM
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1994 YJ Wrangler 
Join Date: Apr 2013
Location: Memphis
Posts: 338
You should disconnect the battery for a bit (30 minutes?) whenever you replace a sensor to reset the computer. Just on general principles
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post #3 of 3 Old 07-07-2013, 02:07 PM Thread Starter
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Thanks for the reply jred... I ended up getting a new battery as the other was from 1990. That was at least a hour with the battery disconnected. It's still running rough and the idle went from 900 to 1K. That I can live with, I've added octane boost to see if that helps. The knock has lessened but is still there specially when first started.
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