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I just replaced bank 1 sensor 2 and was wondering if it is a good idea to go ahead and replace the 3 others? I plan on in the next 6 months going with a new full exhaust and will they still use all for sensors? Thanx guys this forum has helped me alot with my new toy!
 

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Which truck model, year, number of miles, etc? For an older truck, personally, I'd probably just go ahead and get 'em replaced while I'm messing with it.

But if you go with a cat-back exhaust system, which is the recommended way to go, that won't get anywhere near the O2's. So you're all set!
 
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