Title: did not work
Product review: ordered all four O2 sensors for my ford f250. the two downstream o2 sensors worked just fine and cancelled two codes. The two new upstream sensors added 4 codes (i only had 2 to start with)..... they weren't working. I reinstalled one of the old Bosch o2 sensors and it worked just fine now im down to one code. I will NEVER buy Denso o2 sensors again. i have ordered a new bosch as the last replacement. A simple 1-2 hr job took 2 1/2 days
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