Replacing O2 sensors

Bob.Gibson

TJ Enthusiast
Supporting Member
Joined
Sep 8, 2019
Messages
159
Location
New Zealand
My TJ has done 78,000Km
I read somewhere on here that its a good idea to replace the sensors at around 80,000.
I've checked my Total Fuel Trim for Bank 1 Sensor 1 and Bank 2 Sensor 1.
Both sit around -5% and only fluctuate a little with changes in load or throttle position.
This suggest to me that all my sensors are doing their jobs correctly and I don't really need to replace anything.
Is this correct or have I missed something?
 
That's not a lot of miles/kms for an O2 sensor. For newer OBDII vehicles like our TJs the recommended change interval is typically closer to 100k miles/160km.
 
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One of my uppers started throwing CEL lights at about 168,000 miles. I soaked them with PB Blaster daily for 3 days before I changed them, they came right out. I replaced both uppers in < 20 minutes and no CEL since.
 
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