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Discussion Starter · #1 ·
I'm on my 3rd O2 sensor. Still getting code 21. Although the Bosch O2 sensors look different than the stock one. Also, the parts store people have given me different part #'s each time. What is the correct part #? 1997 TJ 2.5L.
 

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Discussion Starter · #2 ·
Just read the error code definition again.I didn't realize 21 applied to the downstream sensor too. I will replace that next.
 
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