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how many wires are on the rear 02 sensor? 3 or 4? i know one of them is 3 and the other is 4 and yesterday when i walked in the store i drew a blank... newayz tia
 

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It seems each vehicle can be different. I know on probetalk.com, different people have a different number of wires depending on the location of residence. My car has 4 wires on each side. The best thing to do is to check and see exactly how many wires your own car has rather than comparing it to others. It "should" be the same number of wires on both sensors. Either 4 or 3.
 
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